No particular problem, except for an old unresolved bug that can maybe (or not) explain the strange behavior you see: <a href="http://bugs.racket-lang.org/query/?cmd=view&pr=12070">http://bugs.racket-lang.org/query/?cmd=view&pr=12070</a> Though I already had that bug under older versions of Ubuntu. Laurent <div class="gmail_quote">On Fri, Jul 20, 2012 at 8:56 AM, Neil Van Dyke <<a href="mailto:neil@neilvandyke.org" target="_blank">neil@neilvandyke.org</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Just a sanity-check question, no cause for concern... Has anyone seen strange behavior with Racket on Ubuntu 12.04? I have some code and data that reportedly runs fine on an older version of Ubuntu (which will take a while for me to verify), but that that at some point has an incorrect Racket value internally when run under Ubuntu 12.04. (In this case, Racket is 5.2.1 with CGC collector on x86 32-bit, and there is an old-style CGC C extension involved, which has worked on multiple platforms for many years under heavy loads.) I suspect there is a simpler explanation (i.e., a recent application code change that does not actually run anywhere), but while I wait for verification, I thought I might as well sanity-check possible Ubuntu 12.04 problems, however unlikely. Thanks, Neil V. ____________________ Racket Users list: <a href="http://lists.racket-lang.org/users" target="_blank">http://lists.racket-lang.org/users</a> </blockquote></div>