Seems as though certain keys are just unable to be bound to the "upgrade ability X" keys. I didn't have an issue with this prior to the patch, using shift as my Ability 2. I'm assuming this is due to the changed behaviour in the Tab and Alt key behaviours you mentioned in the patch notes?
Basically, I can play and use shift as my ability but I'm unable to create the binding 'Alt + Shift' for upgrading an ability. It just doesn't register the shift.
Basically, I can play and use shift as my ability but I'm unable to create the binding 'Alt + Shift' for upgrading an ability. It just doesn't register the shift.