So, this happened:
(http://i64.tinypic.com/15eybmp.jpg)
Not sure exactly why it happens, everything worked fine until I imported an image with an alpha channel, which seems to have loaded incorrectly. Even though I deleted the image (and associated objects), and left everything as before importing that image, the error continues to appear. Any ideas? Thanks!
The error information indicates that this crash occurs while preparing character #6's sprites for drawing. (Not certain what 866 means in this context)
I may suggest to double check that character #6 animations do not contain any glitched sprites or reference sprites that dont exist anymore.
Yep, that was the error. for some reason several sprites have been ruined. Thank goodness I was able to re-import them from their sources!