Wow man, I am really surprised too. I wonder what would happen if you flashed the ROM image back on, by downloading it to a PC, connecting up your phone, and then re-flashing?
The stock Sprint image is on the HTC site:
http://www.htc.com/us/support/touch-...int/downloads/
If you do this, make sure to do another hard reset after the flash, and then a soft reset. I know you mentioned you have a replacement en route, but if you know everything else is good with your phone, may want to try the re-flash. Otherwise you'd be rolling the dice with the replacement, it may have a hw problem or other quirk that you don't have now. Nothing to lose by trying
