When pasting anything in the matrix and percussion matrix editors, occasionally some some notes will be offset by a small amount. This will sometimes happen even with a short snippet. If the pasted section is long, the chance of some notes being misaligned seems to increase towards the end. The misbehaving notes always seem to slip forward in time, and the offset is usually less than 1/16.
This keeps bugging the bejesus out of me, because it forces me to manually inspect everything I paste. Even quantizing the pasted area doesn't work because the misaligned notes may be closer to the next note position than the correct one.
Just so that you know: I have paid close attention to actually pasting in the correct place, for instance by zooming in 1000% and then setting the cursor position. This bug isn't the result of sloppy mouse usage.
To reproduce create a short drumbeat, copy it, and paste it successively until you observe the bug. If you want me to trace what the program does when this happens I'll be glad to, just tell me how.