Hey!
I have the same problem.
After video uploading (10 sec, 1.4Mb) script is working on "video/cgi-bin/uu_upload.pl?tmp_sid=baa639a46c55dcaf190a04b4af31c aac" a long time

after that I see:
"MySQL server has gone away"

It's not MySQL server problems!!! MySQL server works fine and I cannot increase his connection timeout (now it's 30 sec)

Any ideas to correct this problem?

So, one more question:
- What doing cron? I have setup it - but I don't know what it doing.

Wait for any help.