Frames with different sizes will be stretched when exported.
<img src="https://dl.dropbox.com/u/47035927/temp/player-sheet0.png" border="0" />
This is from a basic template, where I have, for example, 2 animations on the same gadget. The crouching animation I did with half of the size, for detection purposes (detection when inside a role, for example). Inside the editor, it run flawless, but when exported, it make this strip and stretch the frames.
Edited:
I separated the animations in folders, and I have no idea of why, but it make the strip correctly after it:
<img src="https://dl.dropbox.com/u/47035927/temp/player-sheet1.png" border="0" />