[racket] Racket 5.3.2 Error, when open file/tab

Dear Racketeers
 
When enabled the "Open files in separate tabs ." setting,
Racket fails to open a file, with the following error message:
 
sequence-contract-violation: negative: method end-edit-sequence cannot be
called, except in states (in-edit-sequence)
  context...:
   C:\Program Files\Racket\collects\framework\private\text.rkt:1740:4:
after-edit-sequence method in ...ork/private/text.rkt:1611:2
   C:\Program Files\Racket\collects\mred\private\wxme\text.rkt:758:2:
end-edit-sequence method in text%
   C:\Program Files\Racket\collects\drracket\private\unit.rkt:2996:6:
change-to-tab method in ...ket/private/unit.rkt:1376:4
   C:\Program Files\Racket\collects\drracket\private\unit.rkt:2966:8:
core3833
   C:\Program Files\Racket\collects\mred\private\mrmenu.rkt:250:14: command
method in basic-selectable-menu-item%
   C:\Program Files\Racket\collects\racket\private\more-scheme.rkt:146:2:
call-with-break-parameterization
   C:\Program Files\Racket\collects\racket\private\more-scheme.rkt:263:2:
call-with-exception-handler
   C:\Program Files\Racket\collects\mred\private\wx\common\queue.rkt:451:6
   C:\Program Files\Racket\collects\mred\private\wx\common\queue.rkt:502:32
   C:\Program Files\Racket\collects\mred\private\wx\common\queue.rkt:650:3
 
When disabling this setting, and restarting Racket, I can open files
in separate windows.
But when trying to click Menu>File>New Tab, same error as above.
 
I'm on Windows Vista, 32Bit, Service Pack 2, English.
 
Is there something I can do?
 
Thanks in advance.
 
Martin
 
 
 
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