I think it would be best if you sent me the unfinished level so that I can take a look myself and see what might be happening. My email address is "zubenowski AT gmail.com" (remove spaces and replace AT with @).
I found the issue... you used the incorrect tilez for the water bridges. You used 264, which is those bridges that go up and down at regular intervals, NOT the ones that can be operated by switches. 264 does still use the TileTrigger logic, but instead it uses it to know how fast those bridges are supposed to be going up and down. Since the value was zero, and since the game just couldn't make them go up and down THIS fast, it was simply crashing in response.
To fix the problem, you need to replace the 264 tile with the 258 tile.
One other problem I noticed is that one of the purple switches didn't have CalcCowID pressed... and the purple pyramidz were given an incorrect value of this switch in Rects.