Color changes in the Render window + Undo in the Paint tool

Two questions:

If you press the A-key in the Render window, strange things happen :o Would anyone happen to know what it is?

Is there a more advanced function for the Paint tool in the UV-window that I’m not aware of? Multiple undos and redos maybe?

Hi Egg, believe A in the Render window is the Alpha channel - think I read that somewhere. With regard to multiple undo [when CTRL-Z fails] best practice is saving copies before radical changes. Blender has that neat function ‘+’ on the Numpad, to quickly extend your ‘Save as copies’. Hope that helps…

Thank you. Too bad about the limited undo…