Cannot perform an addition within width or height field

I think this might be related to your keyboard layout. See this thread where they discuss the “+”:

This is actually a bug.

’ + ’ works normally in X and Y input fields, but it doesn’t work in Width and height.

Worked perfectly before, now after the latest update this problem appear.

Thank you for raising this, as @Merzuk noted this is something our engineering team is investigating further currently. You can follow the thread IraX posted above for updates.