First error with my PSR-500. Worked fine the night before, was listening to the TG's working the President's visit. Next morning, it turned on OK. But when I pressed any button except the light button, it would display "Heap Error" with some numbers in the line below that. Did some testing by loading another folder via software. That folder worked fine. So to fix the problem, I created a new template and copied over all the data. Has worked fine since. Just something in the data for the folder.