I have managed to get the project working again by painstakingly changing each of the 52 instruments to a different instrument patch and then back again to the correct patch. Once I did that, the crashing stopped--so far at least. Now I have a bizarre problem with the Play instruments going out of tune for no reason I can find. EastWest refuses to help since this is with Cakewalk, so it remains to be seen if I can actually finish this or not.
David Pollock's post in Crashing problem solving was marked as the answer