"can't attach to window"

I’m getting a weird message in the Max window saying "jit.qt.movie can’t attach to window foo." Occasionally I can get it attach, although I can’t reproduce it faithfully enough to detect what I’m doing differently. The odd thing is that I’m using the exact same setup for both ji.qt.movie and jit.window that I use in nearly all my patches, with direct to window. I can’t find any documentation of this error on here. Any ideas on what could be causing it?

Thanks,
Zach