One channel freezes up on master fader

[Viktor]

Hey everyone!A couple months back I upgrated my system to Athlon 2500 on 2Forge MB(DIGI 001,Windows XP-SP-1)It worked pretty stable for a while,but weired thing happend yesterday.
In the middle of the song right channel of the master fader freezed all the way up with red led,sound disappeared also from one channel,session didn't stop though.I hit STOP then PLAY-playback started whith no sound on one channel and righ indicator stiil freezed.There were 3 plugs-Joomeek MeQ,C4 and PowDither on master.If I remove one of these 3 it works in a normal way(whith the crack from right channel) ,but when I load it back-I got all the same.
Whith almost no hope I expect someone can explane to me what is all about.
Thanks.