Noticed some presumably unintended odd behavior in the sprite editor:

It seems that any time the selected region is flipped while not over its initial position, pixels are changed underneath it. Using version 0.2.1b on a Mac.

Edit: I will note that something like this seems like it could actually be somewhat useful behavior, as it lets one duplicate an already selected area within a sprite without having to copy and deselect it, but it's pretty odd right now. For example:

Noticed another oddity with moving selected regions while testing this: if one has copied a group of pixels, then selecting a region, pasting with CTRL-V, and moving the selected region will cause the pasted pixels to disappear.

The map editor also appears to be having some similar issues: