BuddyPress.org

Seems really odd that your WPMU + BuddyPress installation somehow takes up over 30MB of memory.

You could try upping the available memory to say, 40MB or so, and see if that helps? Do a search here (or Google) for php.ini and hopefully that should help you on your way. There are a few things you can put there to help increase the available memory for your hosting package.

Basically you just make a file called php.ini and put it either in your WordPress root directory, or your wp-admin directory. I’m not sure it really makes a big difference, but I suppose it also depends where the errors are coming from mostly too.