I have a decent-sized WordPress install that I'm using for a CMS (45 users, many with their own role). So far this problem has only occurred for users with role "Editor":
First the app was running out of memory when they would access /wp-admin/edit.php (WordPress 2.8.4). The error was being reported from:
role-scoper_main.php on line 692
I increased PHPs and WP's memory limit from 32MB to 64MB, which resolved the memory issue, but now the page takes forever to load and results in this error:
Fatal error: Maximum execution time of 30 seconds exceeded
Once again, this is in role-scoper_main.php on line 692. I've interrogated that line of code, but must say that without foundational knowledge on how the plugin works, I can't decipher whats going on there.
For now I have promoted those users from Editor to Administrator role (yikes!) and the error goes away. Any ideas what could be causing this?
I'd be happy to provide any debugging information that would be useful. Thanks!