I noticed this anomaly:
Suppose I rip a series of DVDs with WinX DVD Ripper.
To do this, I open MC which displays the open panels, let's say A and B.
To rip my DVDs, I change panels for example to C and D,
I run WinX DVD Ripper to extract a whole series of videos from my DVD,
and I ask Win DVD Ripper to turn off my Computer once its task is finished
because I have to be away...
When I return, or the next day, when I turn my computer back on,
when I open MC it does so with panels A and B and not C and D.
because MC was closed with the computer and not by leaving MC...
To overcome this malfunction, while ripping my DVD, I close MC and reopen it...
and the problem is solved.
Hoping to have been useful to Mathias and everyone.