For me cmanager did not quit properly if using 'Menu -> Exit'.
Today I experienced this bug also on another computer, on a totally different Linux system.
This motivated me, to invest some time to figure out the problem.
I also found out that if I click the 'x' on the window frame, cmanager quits properly.
So there was a difference between these two ways of quitting cmanager.
For me cmanager did not quit properly if using 'Menu -> Exit'. Today I experienced this bug also on another computer, on a totally different Linux system. This motivated me, to invest some time to figure out the problem. I also found out that if I click the 'x' on the window frame, cmanager quits properly. So there was a difference between these two ways of quitting cmanager.