Hi Janno.
Try checking the panner to be certain the track in question is only routed to the front - the default is actually F50 - which is not all the way front, which would be F.
Another way to get the sound in only the pair you want is to open the F4 setup window & create child busses in the 5.1 master output (I always make one for Stereo L-R and another for stereo Ls-Rs)
Finally - I have to ask - why run the 32-bit version on a 64-bit OS with 8GB of RAM?