Change set has apex fatal error, but no apex?

I have a change set that fails while running the apex tests. It alerts  ‘Fatal Error’, but gives no other information. The odd part about this is that I am not uploading any apex. I have a Visualforce page, but uploading the changeset without that page results in the exact same error. Other changesets were uploaded today with no problems. Running a test on all apex classes results in one failure (out of 18 tests), but this failure is from an installed application.