Can't save post submitted for review by author

I set this up to have specific user groups with specific (author) roles for specific categories — so they are only able to make posts in the categories to which they’re assigned. That part seems to be working (can’t tell 100% yet), but after the author submits a post and exits the post/signs out of WP, the administrator can’t publish the posts — when you select the Save button, the post says that the author is editing the post (when they’re not).

How do I fix this?

(Is the plugin developer reading/responding to support posts anymore?)

http://wordpress.org/extend/plugins/user-access-manager/