The OpenX installer choked because the memory limit for PHP wasn’t high enough for it’s liking. The fix for this is pretty simple:
Make sure your domain is running PHP 5.3. Create the directory
~/.php/5.3/ and a file called
In your phprc, just add
memory_limit = 128M to appease the cranky OpenX installer.
killall php53.cgi to make PHP pick up your new settings, and retry the OpenX installer. It should work normally from there.