Shimano gear indicator stuck I've got Shimano Deore shifters like the one on the picture

and XT rear derailleur.

The shifter and the derailleur work perfectly well, the chain and the cassette are quite new. Bit the problem is that the indicator is stuck on the "high gear" - at the right and is not moving.

Should I replace it or can it be fixed?
Remove those two screws visible in the picture and lift off the indicator. It may be that the mechanism to move the indicator has become dislodged. 

You could, as I do remove the indicator completely. Sometimes underneath there is a blanking plate you can use to cover the hole. You don't need to see which gear you are in and it means you can move the lever closer to your brakes for a tidier bar layout.