I've just switched to autocad 2013 and I've found that all the dwgs saved with previous versions appear with a white background thumbnail. I've tried to find a way to turn it to the classic black but without results.

The dwgs saved on Autocad 2013 do have a black-background thumbnail when viewed on Autocad 13 but they have a white backround when viewed with Autocad 2011 which I'm still using in parallel while I get the new version sorted out. This latest one is a problem which I would also like to fix but not as important as the first problem because I have to access a large database of drawings saved with previous versions and I can't just go and open and save all of them to change the background of their thumbnail.

I would appreciate any suggestion,

thank you

M.