you should write compiler version and OS for such problems.

I/O in Windows threaded RTS was fixed after initial 6.6 release and afaik hWaitForInput should work better now. alternatively, you can

Of course, this was 6.7-20070404 on Linux x86. I haven't had a change to test it on my 6.6 build. try

with hand-made timeout solution

I'm not sure what the status is on hWaitForInput with the snapshot that I am using -- any other ideas what I could try to further isolate the problem? - Scott Bell