2 New bugs! Okay, first go into Animaniacs mode, then scroll to the bottom of Layer 4, then look at the coordinates of the currently highlighted tile, you'll see that the last tile or so is being cut off. That's the first bug. Next, try to place a tile in a place that you can't see (I placed a tile at 1,64), then resize the layer to be 256 x 66(Assuming the old Layer Size was 256 x 64), and MLLE will crash.

Here's a video of me doing this glitch:

(Here's a link in case you can't see embedded videos)