When playing a movie, black dots appear in background

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I'm using Bsplayer ver. 1.00, build 810,16.
Codecs installed: DivX, XviD.
Video card: Geforce 4, CPU: 2.8GHz pentium, 768MB Ram, OS: XP.

My problem is, when playing divx/xvid movies *specifically* on Bsplayer , when the movie is dark or there's a black screen for a few seconds i see all kinds of black\grayish spots. it happends only when I use BSplayer, tried to use other media players and the problem did not occur.

I hope theres a solution for this problem since I love using Bsplayer, i think its the greatest player out in the net.. so if this problem will B fixed, i have no more requests from BSplayer :]