Okay, I have resolved this error by renaming the file. There is however, an annoying, but potentially useful bug that I found.

After running through speed blocks by tapping the run key, I proceeded in my level to un-freeze a spring. Above the spring was a large 6x6 mass of destruct blocks. After unfreezing the spring (or sometimes before), my weapons were disabled....all of them. This limits the player to physical attacks, but I also had an annoying problem with events (pickups and baddies specifically) disappearing.