Importing a .png spritesheet with the new 0.2.1 version doesn't seem to work as before. Some of the transparent pixels are being considered solid and/or some pixels are doubled in size.

In this 16x16 spritesheet all the cells are read as 17 pixels because of the color aberration:

Detail of the first sprite:

False flag, sorry, wrong import in version 0.2.0h3 as well. Something's wrong with my .png.