That's a bummer HJ. Sometimes you lose them even if the shot seems perfect and you put the time in tracking. Too bad. I wouldn't even know how to begin archery hunting a bear. Had you scouted and found a good trail or area they frequented or just hoped to get lucky and see one or what?
Also, there is a facebook page "PA black bear hunters" that has allot of members and tons of bear pictures. It's worth checking out if anyone is on facebook.
-Jake