hello AzDude, Basj,
thanks for the extremely quick response !
but both links have not helped. also i have detached the laptop from the docking station, and ran it on its own.
the fences are existing, eg. their names are displayed and also the menu icons at each frame are selectable, but all background color is dark black, and thus no frames visible.
when selecting "configure fences" and then going to "layout & snapping" and selecting the desired theme (snapshot) and do restore a question window will come up "take snapshot before restoring" with 3 options, and i'm selecting (2) No/just restore snapshot, then i can see the icons on the desktop changing slightly their position for about 1..2 sec, and then returning where they have been, but the desired color arrangment is not happening - still all background in dark black.
i had done such operation on a similar case a longer while ago, and it worked then. now it won't.
the W10 is Enterprise N ver. 1803 , OS build 17134.1550
hopefully you can find a solution,