SUMMARY User can set a corner to trigger this effect even if it's not enabled in effects. This results in it being assigned but not working. AFAIK there are two possible solutions for this: 1. Assigning the effect to a corner also has to enable it in effects or 2. there shouldn't be an option to assign a corner to this effect if it's not enabled Side note: This effect is not enabled by default after updating from previous versions of Plasma, shouldn't it be?
*** This bug has been marked as a duplicate of bug 448568 ***