Well first things first... The syntax for setting upload limits is:

$CGI::POST_MAX=1024 * 200;  # max 200k posts
# also, though it's already a default...
$CGI::DISABLE_UPLOADS = 0;
[download]

I don't know where your got the $cgi_lib::maxdata line, but it's not going to to anything. Note that CGI.pm is entirely different from cgi-lib.pl, and CGI.pm is the generally recommended tool. Sounds like you might be looking at docs or code that were written for cgi-lib.pl.

To narrow the problem, you could try a simple form with no file fields, just a text box or two, and see how the simple test script responds.

I've posted a copy of the test script at http://lmsg.net/cgi-bin/lc1/formtest.cgi, feel free to point your form at it for testing. (Max 200k posts is set.)

Update, typo: changed from /cgi/ to /cgi-bin/

If the test script works on my server, but not yours, I suspect you might have networking and/or server problems. On the other hand, if it doesn't work for you on my server, I suspect you have client/browser problems, since your sample form works nicely for me when pointed at the above URL. I get...

Got Something:
• file: C:\temp\test.jpg
• Submit: Add Image

What OSes are involved, and what web server software are you using? Also, be sure to clear your browser cache when doing testing like this, I tell ya the wierdest stuff can happen with IE's caching :)

Good luck....