A couple of weeks ago, near the start of the public beta, I successfully converted a sheet that contained over 200 individual sprites into frames. Today, I attempted to convert one which contains 617 frames (You may think I'm crazy, that's fine ), and the editor locks up. But I'm curious if this is a result of my hardware, or a bug. I did submit a bug report already, just in case. Mostly curious to see what other people have had success with/your experiences in this regard.