Buss Bleed - why does this happen?

PeterVred wrote on 4/5/2003, 8:58 AM
Vegas 4.0- situation:
I assign snare drum to efx bus 1, give it some reverb.
when i solo a different istrument, i hear the reverb of the snare along with the solo'd instrument
!
when i rendered an edited kick drum track to a new wav file, the reverb of the snare printed along with it!

when soloing or rendering if i "mute" the buss, it goes away.

This same thing happens with adding any type of buss.

can anyone tell me why this is so?