Quoted from rodcom:Just got a Batman - the joker standup gets stuck on the left side. Several posts here about it but no best solution that I can find. Any recommendations????
I had the very same problem on mine. Apparently, this was an ongoing problem that was eventually fixed by Stern (although I'm not exactly certain what they did to remedy this).
You could try repositioning both of the targets by loosening the screws below the playfield. Initially, that's what I did, but the problem soon returned.
What I wound up doing was removing the right target (which is what the left one is hanging up on), and using a Dremel with a cutting wheel to remove the top of the target switch mount. The mount, when viewed from above, looks to be in the shape of an "L"; I just cut off that one side of the "L", that shows above the playfield, that the left target was rubbing against. It has worked correctly ever since.
Hope this helps.