In Photoshop 27.6.0, when I click into a layer's opacity field and press 2,4,6 or 8 on the numpad (numlock is on), I get the error "Could not use the move tool because of a program error".

​@Hannes Drexl I cannot replicate the Issue with Photoshop version 27.7 on Windows 11, have you tried updating to that version, if updating doesn’t help, try manually resetting your Photoshop preferences