Well, oddly enough, I tried to play detective and take the thing apart. Initially I thought it was a fruitless venture, but when I screwed the case back on the trigger had magically fixed itself and now it's running great (popful mail) and awful (microcosm) games without issue. Sorry to waste your time. I guess this thing must have been sitting in somebody's closet for 10 years and some dried up nastiness must have gotten the button stuck. Thanks for looking at the thread, though. I'll be sure to post angrily should I have more issues with it.