Hi

I am running an application (Matlab 2013b) on a remote machine (CentOS 6.5) forwarded by X11 to my machine (Ubuntu 12.04) and strange things happen:
When I open extra windows (editor, figure), these windows are somehow 'invisible' to the cursor.. i.e. i can move them to the front using the drag&drop bar, but if I click into them i select only the main window which is directly behind.

I didn't have this problem until the server got updated (both Matlab and CentOS), but other users (also ubuntu) don't have this problem.

I'm trying to find out where this problem comes from, but I don't have a clue. I am grateful about any ideas! Thanks!