[Mad Genius Audio]

Hey all. Lately, I've been trying to lay down some tracks using EZdrummer. For some reason now, when I insert any sort of pre-programmed MIDI file into my session, and try to navigate, I get an "Access violation occured" window, then all of my EZdrummer MIDI is lost. Any thoughts on this? I have not changed or tweaked my computer settings at all since the last time I was recording, and that time it was working fine. Thanks.