When we upgraded to 3.6.5, we got a problem with the drop down menues in user management persists and will not fold back when clicking outside the menu. The dropdown covers the other menues/alternatives.
When using changing roles, the Save and the X button are also covered (but this we could solve with CSS in our Essential theme)
We do not have this problem in our 3.6.4 test environment.
The images are from when using Clean theme.