If after installing Glims your restored tabs look selected or the tab borders are not displaying as they should, you most likely have the Logitech Control Center 3.1 installed.

Since no one wants to uninstall LCC, we wanted to point out the two threads on the Logitech forum talking about it.

This thread describes the issue:

This one is a proposed solution until a real one is available:

Thanks to Michele for finding the solution.
Thanks to Hans and Sylvain for testing non stop our different builds for the past two weeks.