Wow! I am having the same deal as muck, starting yesterday. Had mine in my pocket while working and then next I know, the trackball can't click anything, and the back button stops working. I can use enter/return to do most everything I would click, but the lack of the back button is a pain.

Read someone else with a pearl had luck squeezing the trackball really hard, but no luck there (I may be just afraid to squeeze hard enough - worried about breaking it more).

Have had mine about 4 months, with no issues keeping it in pocket til now.