I’ve been having a problem for a while where on the admin side of wordpress where it would display a blank page (eg. plugin page, auto upgrading wordpress or plugins). I finally figured out that it was a memory limit problem. To fix this I increased the php memory limit. There are a couple of ways to do this.
1.Edit the php.ini File:
Just edit the file in a text editor and search for the memory_limit if you can not find it add it without the quotes
“memory_limit = 64M” (here i increased mine from 32 megabytes to 64 megabytes in order to fix the problem I was having)
2.Editing the .htaccess File:
php_value memory_limit 64M" to your .htaccess file.
(Note: .htaccess is a unix based hidden file and might not show up, make sure you can view hidden files. In general any filename starting with a period "." is a hidden file on a unix based system so this applies to Mac OS X as well)