I'm glad you like the extension!
I don't really think it's possible for me to fix as the problem is primarily on the FRAPS side. Even if I could fix it I don't really have time to worry about it as I don't use FRAPS anyway. You might have better luck contacting the authors of FRAPS and sending them an example game. I don't think the problem is even related to UFS as you could probably replicate it just by trying to record a maximized Fusion-made game.