Halion 2.xx (latest download), PC, Cubase SX 2.xx (latest)

I've got a situation where if I have one instrument loaded on channel one, and another on channel two, and two notes are on the same beat, one cancels the other out...

For example, drums on channel 1, and bass on channel 2. Measure 1, beat 1, the kick and bass should sound at the same time. I get the intial attack of the bass, but the rest gets cut off.

Now, I can call up another instance of Halion, load the instrument there and route the midi out to the second instance, and the problem goes away.

Any ideas? I might mention that these are imported Giga samples. Seems to be worse on Purrrfect Drums and Dan Dean bass (both imported from Giga version.)