Ray,
I can't help if it is a Vista issue as I use XP on one machine and my main one is still Win2000. However I assume that you are fairly new to TurboFLOORPLAN, so may not know about the problem that seems to appear on most PCs where it does not like using Hardware Acceleration. If you have it on (it is on by default) then try with it off. (Settings/Program Settings/Graphics). Try this for anything odd that happens, as it seems to affect different PCs differently and some not at all. Neither of mine will do the Advanced render with it on.
There are a number of issues in the Advanced rendering area and we are hoping for a shortly. I know they are working on it. If you do get it working and find the renders get lighter and lighter, then if you restart the program it resets it. Hopefully this is one of the problems that gets fixed as it is a pain!
When I render the file supplied by the previous user, who got the same message as you, it renders perfectly, so the file itself is OK, the conflict being in the PC.
Allan