In studio when you use the lock tool either via QaB or ribbonbar it will no longer change your mouse cursor. The cursor remains as the default normal cursor, so it’s impossible to tell the tool is active.
This started happening after the new studio docking behavior was released I think.
Expected behavior
The cursor should change to these icons.
(or perhaps new, better, redesigned ones? 
)
Okay well this was supposed to go to Studio Bugs, but here we are.