Without seeing what code you're running, it's hard to come up with a possible answer. You don't need to provide everything, just pare down your application until you can reproduce the issue with a small bit of code. The nice thing about going through the exercise of trimming out unrelated parts of code is that it will frequently lead you to the answer, or at least provide you a couple nice hints.
I don't personally work with CGI, but I'm sure that if it had a hanging problem, someone would've noticed it by now. If I had to guess (and without code, that's all I can do), I'd imagine that your process is taking a while to run, and without I/O occurring (via your print statements), the connection is timing out and disconnecting so you don't see any results.
...roboticus
When your only tool is a hammer, all problems look like your thumb.
In reply to Re: CGI hangs unless print
by roboticus
in thread CGI hangs unless print
by janedoh
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