Check out this thread (specifically the post by ‘parse’). That fixed this problem for me. The problem reappeared after upgrading to WordPress 2.8.2 and I had to go back and change the value to 64 again (the file appears to have been overwritten during the update).
https://forums.shopplugin.net/topic/activating-shopp-plugin-disables-most-items-on-dashboardt
Good luck.
