Mine is okay by following your steps on my 10.6.7 with 5.1 drracket. Have you tried other modes? I've only got unexpected crashes on 10.7 preview. <div class="gmail_quote">On 3 May 2011 09:47, Alan R. Bleier <<a href="mailto:arb23@cornell.edu">arb23@cornell.edu</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Hi, I'm a Racket/scheme newbie, but not a computer newbie. Matt helped me figure out a font problem that caused a crash before the Racket window opened. Now in beginning student mode when I press enter after (+ 5 5) in the lower window, DrRacket crashes. This is DrRacket 5.1 (5.1) on Mac OS X 10.6.7 I'd love to get it working if someone can help me. Alan Here is the crash log: Process: DrRacket [2597] Path: /Applications/Racket v5.1/DrRacket.app/Contents/MacOS/DrRacket Identifier: org.racket-lang.DrRacket Version: 5.1 (5.1) Code Type: X86 (Native) Parent Process: launchd [146] Date/Time: 2011-05-02 21:18:17.179 -0400 OS Version: Mac OS X 10.6.7 (10J3250) Report Version: 6 Sleep/Wake UUID: B67CAB87-6599-44E3-BF74-C6D389D99626 Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Crashed Thread: 0 Dispatch queue: com.apple.main-thread Application Specific Information: abort() called Thread 0 Crashed: Dispatch queue: com.apple.main-thread 0 libSystem.B.dylib 0x94d7a17a __kill + 10 1 libSystem.B.dylib 0x94d7a16c kill$UNIX2003 + 32 2 libSystem.B.dylib 0x94e0c879 raise + 26 3 libSystem.B.dylib 0x94e229b8 abort + 93 4 Racket 0x001f9291 scheme_wait_until_suspend_ok + 241 5 Racket 0x0019acec scheme_wait_semas_chs + 492 6 Racket 0x00204d43 syncing_ready + 1347 7 Racket 0x002045bc scheme_block_until + 172 8 Racket 0x0020635d do_sync + 1197 9 Racket 0x00206c35 sch_sync + 53 10 ??? 0x002f699f 0 + 3107231 11 ??? 0x00461e60 0 + 4595296 12 ??? 0x18a14920 0 + 413223200 13 Racket 0x0005498c scheme_do_eval + 5884 14 Racket 0x00055f08 _scheme_apply_multi_from_native + 88 15 ??? 0x002f693d 0 + 3107133 16 Racket 0x0005498c scheme_do_eval + 5884 17 Racket 0x00078304 apply_k + 180 18 Racket 0x000779f6 scheme_top_level_do_worker + 822 19 Racket 0x00077c38 scheme_top_level_do + 40 20 Racket 0x000332e8 call_error + 1256 21 Racket 0x000386b9 def_exn_handler + 329 22 Racket 0x000554a4 scheme_do_eval + 8724 23 Racket 0x00033a0a do_raise_inside_barrier + 522 24 Racket 0x000779f6 scheme_top_level_do_worker + 822 25 Racket 0x00077c38 scheme_top_level_do + 40 26 Racket 0x00033d08 do_raise + 440 27 Racket 0x00033ff5 scheme_raise_exn + 309 28 Racket 0x00035a92 scheme_wrong_type + 274 29 Racket 0x0003811f raise_type_error + 783 30 ??? 0x0040ed6a 0 + 4255082 31 Racket 0x0005498c scheme_do_eval + 5884 32 Racket 0x00216389 SCHEME2C + 281 33 Racket 0x00217933 ffi_do_call + 1235 34 Racket 0x0005599c scheme_do_eval + 9996 35 Racket 0x00056098 _scheme_apply_from_native + 88 36 ??? 0x002f99bf 0 + 3119551 37 Racket 0x0005498c scheme_do_eval + 5884 38 Racket 0x0007022c do_dyn_wind + 44 39 Racket 0x00084535 scheme_dynamic_wind + 789 40 Racket 0x00084ba0 dynamic_wind + 320 41 ??? 0x002f699f 0 + 3107231 42 Racket 0x0005498c scheme_do_eval + 5884 43 Racket 0x00056098 _scheme_apply_from_native + 88 44 ??? 0x002fef3f 0 + 3141439 45 ??? 0x002f69cf 0 + 3107279 46 ??? 0x002fe860 0 + 3139680 47 ??? 0x002fe470 0 + 3138672 48 Racket 0x0005498c scheme_do_eval + 5884 49 Racket 0x00055f08 _scheme_apply_multi_from_native + 88 50 ??? 0x002fdc7a 0 + 3136634 51 Racket 0x0005498c scheme_do_eval + 5884 52 Racket 0x0007022c do_dyn_wind + 44 53 Racket 0x00084535 scheme_dynamic_wind + 789 54 Racket 0x00084ba0 dynamic_wind + 320 55 ??? 0x002f699f 0 + 3107231 56 ??? 0x011f146c 0 + 18814060 57 ??? 0x011f146c 0 + 18814060 58 Racket 0x0005498c scheme_do_eval + 5884 59 Racket 0x0007022c do_dyn_wind + 44 60 Racket 0x00084535 scheme_dynamic_wind + 789 61 Racket 0x00084ba0 dynamic_wind + 320 62 ??? 0x002f699f 0 + 3107231 63 Racket 0x0005498c scheme_do_eval + 5884 64 Racket 0x0007e678 scheme_finish_apply_for_prompt + 696 65 Racket 0x0007e817 scheme_apply_for_prompt + 103 66 Racket 0x00088630 call_with_prompt + 1184 67 ??? 0x002f699f 0 + 3107231 68 Racket 0x0005498c scheme_do_eval + 5884 69 Racket 0x00055f08 _scheme_apply_multi_from_native + 88 70 ??? 0x004edf27 0 + 5168935 71 ??? 0x002f69cf 0 + 3107279 72 Racket 0x0005498c scheme_do_eval + 5884 73 Racket 0x0007e678 scheme_finish_apply_for_prompt + 696 74 Racket 0x0007e817 scheme_apply_for_prompt + 103 75 Racket 0x00088630 call_with_prompt + 1184 76 ??? 0x002f699f 0 + 3107231 77 Racket 0x0005498c scheme_do_eval + 5884 78 Racket 0x0007e678 scheme_finish_apply_for_prompt + 696 79 Racket 0x0007e817 scheme_apply_for_prompt + 103 80 Racket 0x00088630 call_with_prompt + 1184 81 ??? 0x002fe586 0 + 3138950 82 Racket 0x0005498c scheme_do_eval + 5884 83 Racket 0x00077e5f force_values + 271 84 Racket 0x00077fe2 scheme_force_value_same_mark + 98 85 ??? 0x002fdadc 0 + 3136220 86 Racket 0x0005498c scheme_do_eval + 5884 87 Racket 0x00055f08 _scheme_apply_multi_from_native + 88 88 ??? 0x002f693d 0 + 3107133 89 Racket 0x0005498c scheme_do_eval + 5884 90 Racket 0x00078304 apply_k + 180 91 Racket 0x000779f6 scheme_top_level_do_worker + 822 92 Racket 0x00077c38 scheme_top_level_do + 40 93 org.racket-lang.DrRacket 0x00004813 finish_cmd_line_run + 3187 94 org.racket-lang.DrRacket 0x00005302 main_after_stack + 1922 95 Racket 0x0000f583 scheme_main_stack_setup + 131 96 org.racket-lang.DrRacket 0x00003656 main + 54 97 org.racket-lang.DrRacket 0x00003352 _start + 216 98 org.racket-lang.DrRacket 0x00003279 start + 41 Thread 1: 0 libSystem.B.dylib 0x94d190ba mach_msg_trap + 10 1 libSystem.B.dylib 0x94d19827 mach_msg + 68 2 Racket 0x00227f12 exception_thread + 210 3 libSystem.B.dylib 0x94d46819 _pthread_start + 345 4 libSystem.B.dylib 0x94d4669e thread_start + 34 Thread 2: 0 libSystem.B.dylib 0x94d191ce mach_wait_until + 10 1 libSystem.B.dylib 0x94da0839 nanosleep + 345 2 libSystem.B.dylib 0x94da06da usleep + 61 3 Racket 0x001435d1 green_thread_timer + 97 4 libSystem.B.dylib 0x94d46819 _pthread_start + 345 5 libSystem.B.dylib 0x94d4669e thread_start + 34 Thread 3: Dispatch queue: com.apple.libdispatch-manager 0 libSystem.B.dylib 0x94d3f942 kevent + 10 1 libSystem.B.dylib 0x94d4005c _dispatch_mgr_invoke + 215 2 libSystem.B.dylib 0x94d3f519 _dispatch_queue_invoke + 163 3 libSystem.B.dylib 0x94d3f2be _dispatch_worker_thread2 + 240 4 libSystem.B.dylib 0x94d3ed41 _pthread_wqthread + 390 5 libSystem.B.dylib 0x94d3eb86 start_wqthread + 30 Thread 4: com.apple.CFSocket.private 0 libSystem.B.dylib 0x94d38086 select$DARWIN_EXTSN + 10 1 com.apple.CoreFoundation 0x91eefc83 __CFSocketManager + 1091 2 libSystem.B.dylib 0x94d46819 _pthread_start + 345 3 libSystem.B.dylib 0x94d4669e thread_start + 34 Thread 5: 0 libSystem.B.dylib 0x94d19102 semaphore_wait_signal_trap + 10 1 libSystem.B.dylib 0x94d46cb8 _pthread_cond_wait + 1089 2 libSystem.B.dylib 0x94d8f48f pthread_cond_wait + 48 3 Racket 0x001436bc pt_sema_wait + 92 4 Racket 0x0014375b do_watch + 59 5 libSystem.B.dylib 0x94d46819 _pthread_start + 345 6 libSystem.B.dylib 0x94d4669e thread_start + 34 Thread 0 crashed with X86 Thread State (32-bit): eax: 0x00000000 ebx: 0x94e22967 ecx: 0xbfffc29c edx: 0x94d7a17a edi: 0x00000000 esi: 0x00000001 ebp: 0xbfffc2b8 esp: 0xbfffc29c ss: 0x00000023 efl: 0x00000286 eip: 0x94d7a17a cs: 0x0000000b ds: 0x00000023 es: 0x00000023 fs: 0x00000000 gs: 0x0000000f cr2: 0x94e0c85f Binary Images: 0x1000 - 0x7ff7 +org.racket-lang.DrRacket 5.1 (5.1) <0463C109-31A4-F520-78CE-D29C69E3FA16> /Applications/Racket v5.1/DrRacket.app/Contents/MacOS/DrRacket 0xe000 - 0x24afef +Racket ??? (???) <9D330AC3-D962-D904-873F-0BD2F731666A> /Applications/Racket v5.1/lib/Racket.framework/Versions/5.1_3m/Racket 0x17ee000 - 0x17f5ff3 +libintl.8.dylib 9.2.0 (compatibility 9.0.0) <3B1AA523-402A-FA2E-84BD-47C0F8B928C8> /Applications/Racket v5.1/lib/libintl.8.dylib 0x2d90000 - 0x2de4ff7 +libpixman-1.0.dylib 18.14.0 (compatibility 18.0.0) <2E93FB64-4072-F496-F4C5-5DEEE7018BE3> /Applications/Racket v5.1/lib/libpixman-1.0.dylib 0x2e01000 - 0x2e20fe3 +libpng14.14.dylib 15.0.0 (compatibility 15.0.0) <77A67018-862D-647D-657A-95DB0E284FE2> /Applications/Racket v5.1/lib/libpng14.14.dylib 0x2e2e000 - 0x2eb8fef +libcairo.2.dylib 10917.0.0 (compatibility 10917.0.0) <BC83BC04-8050-D9E5-B4C5-8A9A1B14519B> /Applications/Racket v5.1/lib/libcairo.2.dylib 0x2f00000 - 0x2fd7ff7 +libglib-2.0.0.dylib 2201.4.0 (compatibility 2201.0.0) <60496527-F4D7-467C-E452-41AE249E3BC7> /Applications/Racket v5.1/lib/libglib-2.0.0.dylib 0x2ff8000 - 0x2ff9ffc +libgmodule-2.0.0.dylib 2201.4.0 (compatibility 2201.0.0) <DB2F3B06-FC60-D7F8-A85E-FB63F9A06093> /Applications/Racket v5.1/lib/libgmodule-2.0.0.dylib 0x2ffd000 - 0x3032fe7 +libgobject-2.0.0.dylib 2201.4.0 (compatibility 2201.0.0) <9C022BC7-FD16-2AA9-E161-55CAF701DF1A> /Applications/Racket v5.1/lib/libgobject-2.0.0.dylib 0x3044000 - 0x3078fef +libpango-1.0.0.dylib 2801.0.0 (compatibility 2801.0.0) <344C0CAE-7A43-9D0B-5722-8E16BB608B70> /Applications/Racket v5.1/lib/libpango-1.0.0.dylib 0x309a000 - 0x30a2fff +libpangocairo-1.0.0.dylib 2801.0.0 (compatibility 2801.0.0) <C8079EFE-0036-E3A5-25F2-93BFA3D401A1> /Applications/Racket v5.1/lib/libpangocairo-1.0.0.dylib 0x30f7000 - 0x3110ff8 +libjpeg.62.dylib 63.0.0 (compatibility 63.0.0) <A9368319-0F6E-A7F4-D0F6-54CED52CCA32> /Applications/Racket v5.1/lib/libjpeg.62.dylib 0x3884000 - 0x3885ffc +com.yourcompany.ct_loader 1.7.0.2 (1702) <86134AFA-C7FF-3505-D2F5-A6305D56DEA5> /Library/InputManagers/CTLoader/ct_loader.bundle/Contents/MacOS/ct_loader 0x4c42000 - 0x4c68ff7 +com.positivespinmedia.PSMTabBarControlFramework ??? 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(???) <B328FA0A-899C-4FC4-F2AC-2FDC08819CD2> /usr/lib/libbsm.0.dylib 0x91e62000 - 0x91e72ff7 libsasl2.2.dylib 3.15.0 (compatibility 3.0.0) <E276514D-394B-2FDD-6264-07A444AA6A4E> /usr/lib/libsasl2.2.dylib 0x91e73000 - 0x91feefe7 com.apple.CoreFoundation 6.6.4 (550.42) <BA29C5CE-77DB-87DB-5B74-9EEFF5265681> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 0x91fef000 - 0x9211dfe7 com.apple.CoreData 102.1 (251) <0C2636F3-CCB4-5ED9-1D3E-5AE36BE57071> /System/Library/Frameworks/CoreData.framework/Versions/A/CoreData 0x92149000 - 0x9214bff7 libRadiance.dylib ??? 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