By default, dragging an image to the Token layer from My Library puts it on the the page at 1 square by 1 square. When I select Resize Item from the context menu on that image, I can change it to any size, say 2x2, and it will drag onto the page at that size. Then if I exit the game, or load the game in another browser or on another computer, or even load another game in the same browser, that image reverts back to 1x1. However, it only seems to do this if the image is in a folder in My Library. If the image is in the My Library root or in Recent Uploads it keeps the changed default size, even across systems and browsers. If the image is moved to a folder, on next reload, it's back to 1x1. I have tested this with both Firefox and Chrome on two different systems. Clearing the cache, disabling browser addons or having no API scripts in the game makes no difference. It also makes no difference if the image is one I uploaded, or one I copied from my Premium Assets. It appears to be the same problem previously reported here .
