Hey raf,
I just experienced a strange behavior that I could reproduce for one remote PC only (Windows 7, TightVNC v2.5.2). I usually work in fullscreen mode and leave the option "restore setting" on. For this particular remote PC only Remoter leaves the fullscreen mode when switching users in Windows.
Secondly, as soon as I login to any user on the system from the Windows login screen Remoter automatically "drops" a part of the screen (starting from the bottom, resulting in the main menubar not shown). The crop behavior is something I experienced and reported to you already a few versions before - and was solved for most remote PCs. Again, the only solution to see the full resolution of the remote PC is to disconnect and reconnect to the remote PC.
As I use the same software setup on multiple PCs and can't reproduce the issue there I'm leaving this as a note to you hoping you've got an idea why this could be happening.
Thanks for all your help. With best regards,
Alex