Issue #1500 has been updated by Jon Coppeard. I am seeing this too. Ruby version: ruby-1.9.1-p129 Cygwin version: CYGWIN_NT-5.1 1.5.25(0.156/4/2) 2008-06-12 19:34 Windows version: Windows XP Professional Ver 5.1 Build 2600 Service Pack 2 If I remove test_io, then all other tests pass. Cheers, Jon ---------------------------------------- http://redmine.ruby-lang.org/issues/show/1500 ---------------------------------------- http://redmine.ruby-lang.org