Originally Posted by yrizoud
Since version 2.4.1950 (May 2012), the program asks you when you save a layered image in a non-layer format : "Save flattened copy" or "Save current frame". It's considered an export, the 'current document' stays the original GIF if you "save and quit" for example.
Ah, that would be the reason then, as I have version 2.3. Thanks for the heads-up. I'll get 2.4 (or should I wait for your updates?)