Okay, many of the problems were being caused by another squeak vm on my machine highjacking the image. With a fresh 4.2.5, ***********************OSProcess test results are... UnixProcessTestCase - it seems like tests that fork (e.g. UnixProcessTestCase>>testClassForkHeadlessSqueakAndDo) hang forever and then things that were working don't work anymore (there is often a warning "forkSqueak requires XDisplayControlPlugin" before something bad happens, but it seems like it gets screwed up whether you hit proceed or abandon). This seems to be the major issue. All pass in OSPipeTestCase, UnixProcessFileLockTestCase, UnixProcessUnixFileLockingTestCase, UnixProcessWin32FileLockingTestCase UnixProcessAccessorTestCase Failures: testChDir testIsExecutableForUserInGroup testIsReadableForUserInGroup testIsWritableForUserInGroup AioEventHandlerTestCase: Errors: '#(''AioEventHandlerTestCase>>#testPrimAioModuleName'' Failures: ''AioEventHandlerTestCase>>#testFileReadableEvent'' ''AioEventHandlerTestCase>>#testFileWritableEvent'' ''AioEventHandlerTestCase>>#testSuspendAioForSocketReadableEvent'' ''AioEventHandlerTestCase>>#testHandleForFile'' ''AioEventHandlerTestCase>>#testEnableHandleAndDisable'' ''AioEventHandlerTestCase>>#testSocketReadableEvent'' ''AioEventHandlerTestCase>>#testHandleForSocket'' ''AioEventHandlerTestCase>>#testPrimAioModuleVersionString'' *********************** CommandShell tests... All pass in ExpressionEvaluatorTestCase, InternalPipeTestCase, PipelineEventsTestCase, ShellSyntaxTestCase PipeableOSProcessTestCase testForkHeadlessSqueakReadAndWriteReferenceStream, testForkSqueak, testForkSqueakReadAndWriteReferenceStream, testForkSqueakReferenceStream give warning "forkSqueak requires XDisplayControlPlugin" testForkHeadlessSqueak, testForkHeadlessSqueak2, testForkHeadlessSqueakReferenceStream give same warning, and then hang CommandShellTestCase - all pass, except testPipeline65 fails. Sean -- View this message in context: http://forum.world.st/OSProcess-on-1-2-tp3569458p3570538.html Sent from the Pharo Smalltalk mailing list archive at Nabble.com.