Well, ran another test and everything went fine.
You might want to delete this thread. I'll be back if I can replicate the problem, but I sincerely hope not . Great app.

Firmware Base 32, Formula Rim 17, Driver 132, Windows 7 , 64.
First I'll be doing a few more runs to see if FFB stays stable. Then I will try again with Fanaleds.

Hoi Gerben en Dirk, Installed Fanaleds on my CSW yesterday (12b). Great app. Like having a whole new toy. Then, within 5 minutes or so the FFB started dropping. Could something completely unrelated, but after removing Fanaleds and reinstalling CSW driver the issue hasn't returned. (still don't quite...