This is for anyone who's dumb enough to create his own problems....like I did!
I thought that all those styles listed when I opened BB would be better if they were all in a separate folder. That's what I was in the process of doing.
Bad move. that's where the problem started.
So...I took all the styles back out of the folder, and the problem disappeared.
Anyway, thanks to those who tried to help, and I hope my solution saves somebody else the grief.