Playbox hangs when pressing play on Logic

I don't know if this helps diagnose the problem, but I've found that Playbox crashes for me every time I try to play a Playbox track in Logic right after opening the file. If, however, I open up Playbox first for every Playbox track, it plays just fine. It seems Playbox might not be getting initialized correctly unless I load up the plugin UI and play a couple notes.