Overlay bug: XviD and jumping dots

[Lastique]

Using BSPlayer for playing an XviD-coded movie I've noticed red and blue square dots jumping over the movie screen, mostly in the
dark places of the picture. Playing the movie in other players (Windows Media Player for example) or disabling Overlay in BSPlayer
solves the problem, but in the last case CPU usage raises. Overlay Mode is Mode 1. Mode 2 doesn't work, when I try to select it
BSPlayer crashes with the following messages:

BSPlayer v0.85.492, Unhandled exception at EIP: 004923A4
If you click 'Close' application will be terminated.
Please report this info to the author with description what were you doing.
Access violation at address 004923A4 in module 'BPLAY.EXE'. Read of address 00000000
EAccessViolation
, 0x004B362F, 0x004B38A9, 0x004520BF, 0x0044972A, 0x77D43A68, 0x77D43B37, 0x77D43D91, 0x77D4438C, 0x004C48B7, 0x77E814C7

Bytes at EIP: 8B 00 FF 50 60 33 C0 5A 59 59 64 89 10 68 CB 23 49 00

By the way, what's the difference between these two modes?

PS: Tried many versions of XviD (up to alpha 14.12.2002), tried ffdshow (up to alpha 13.12.2002) - the result remains the same. Detonator 41.09.