Cannot edit post
 

I have a problem on one of my sites where a user cannot edit a post.
They are being directed to the proper URL, (ie.
http://sitename.com/editpost.php?do=editpost&p=6598)

but then from that page when they hit Save, the post reloads without the changes.

I have checked forum permissions and they have the permission (in fact the admin can't edit any posts either).

any suggestions as to other settings or files to check?

So this is happening on the whole site to everyone? Check the Forum Permissions, not just the usergroup permissions. Or, check and make sure the time limit for editing is long enough for users to edit posts.

Also, try disabling your modifications/plugins and see if you still have this problem.
Note: To temporarily disable the plugin system, edit config.php and add this line right under <?php

re-checked Forum permissions and they're all set to allow editing, tried disabling the plugins that didn't help either

Try this:
Create a new style with no parent:

• Styles & Templates > Style Manager > Add New Style
• Parent Style: No Parent Style
• Title: Default vBulletin
• Allow User Selection: Yes
• Save

Then go to the thread using this totally default vbulletin style - do you still have the same editing problem?