My friend had the same problem, he found all the keys dissapeared and nothing would clear.
I had to do a factory reset, then load the patch again followed by loading the latest softcam. All is now working properly.
If you do this, don't forget to save your channel listing first.
By the way, don't know if it is sgnificant, but I installed the patch via serial port and null modem cable.
Hope this helps, might not be the same problem you have.