Hello everyone,
I made an important discovery today that I would like you to be aware of.
You know how you can click the "edit" button and get those red highlights over custom enemies/items/blocks etc.? Those red highlights will take you straight to edit the thing inside Game Setup. Well, apparently if you click on two of those highlights at the same time (for instance, if you have a custom enemy placed on top of a custom sprite, and so the highlights are on top of each other and you click on them both) it can cause a double-save of the level, effectively corrupting the file. When you return to the level it will probably give you an "invalid license" error when clear the entire file, forcing you to load a backup.
I have seen occasional reports of this issue happening, and I just found out one reason why. I will make sure this is fixed in the next update. Until then, be careful about clicking on those red highlights.
Best,
TingThing