One of the object icons in the Layers panel has an incorrect icon. It's a 3d Box object. I'm sure you're not totally sick of hearing about that object yet
Anyway, sometimes the icon displayed is my player sprite, sometimes it's the Mouse&Keyboard icon. It switches around to different icons, which is strange enough. When I open the picture editor to edit the icon, I get a couple of different errors. Sometimes I get:
[code:2q1myh74]An invalid texture handle was used.
And other times I get:
- pure virtual function call[/code:2q1myh74]
I'm also getting incorrect icons for other objects in the event conditions and actions selectors, and in the event sheet editor, which makes it a little confusing.