Fatal error Allowed memory size on Plugins and Themes

Often now, every time I go to either the plugins or themes areas on the admin side, I get the following message.

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 32 bytes) in /home/websitename/public_html/wp-includes/compat.php on line 181

I have both the pretty plugin and themes plugin installed... not sure if that's the issue. I've also allocated more memory as per another post 64 and 128 i believe.

Any other suggestions?

Thanks
S