Same here - HTC Desire S lost shutdown function
I think it's since I downloaded the new software. Phone won't go to shutdown/restart menu, just ignores the long press, then goes blank when I release it. Also found that it shuts down unexpectedly every now and again, too, which it didn't do before.
Is it possible to go back to the previous version of the operating system? And how would I do that? I don't want to reset everything and lose all my apps/data.
Any help greatly appreciated.