Windows 7- possible bugs with Kore Player and soundpacks

Hello,
I am hoping this is not a bug. I upgraded my Vista laptop (which had Kore player install) to Windows 7. Everything seemed to be running great. But, when I go and play any of my 57 drawbar patches- the notes randomly drop off (I can sustain them and they fall off as if the waveforms are not looping and just playing one shot). It seemed to only affect the 57 drawbar soundpack- but then I tried the accoustic bass that is part of the normal Kore player- and it also has odd cutoffs or note droppings. Again, the only way to explain it is that it seems that none of the waveforms are looping.
Has anyone else experienced this?
The other patches (that don't rely on waveforms) are working fine (and in fact- Kore is working way better under Win 7 then under Vista on my system).
I might try reinstalling the kore pack to see if that fixes it but I am thinking the looping is messed up under Win 7.
Anyone else have any experiences like this?