After upgrading to WP 2.8.6, some of my users have recently started reporting that when they try to save the plugins' option page, they get an error saying:
You do not have sufficient permissions to access this page
I'm unable to reproduce that error. Can someone suggest what is going on, and why it would occur on their blogs, but not mine? They are running WP 2.8.6 (as am I), and I've tested on pristine WP installations, and installations upgraded from previous versions.