I don't know if there's been a patch issued, but it's happening to me at least, here's the problem:

http://forum.swsoft.com/showthread.php?t=51891

"one of my clients is trying to export a database that has a table of 31M in size, but he can't.When he tries to export it to a file he receives a file of 0 bytes in size.Also when he exports it in plain text in the browser he gets a blank page.
I've managed to dump it in the shell but i cannot give the client access to the shell, he must do it through phpmyadmin.
I've tried several tweaks to the php.ini but with no result.
Here are the settings that I've tried to modify from php.ini
Quote:
max_execution_time = 30
max_input_time = 60
memory_limit = 50M
post_max_size = 8M
upload_max_filesize = 50M"

Here's the fix:

1. Open your plesk php.ini (my plesk php.ini located: /usr/local/psa/admin/conf/php.ini)
2. Find memory_limit change to example: memory_limit = 256M
3. Stop and start psa services: /etc/init.d/psa stopall , /etc/init.d/psa start