I had similar problem and it was the current date / time incorrect for me. The way American's express date for me I think... (MM/DD/YY rather than DD/MM/YY)
I have other fun and games with the EPG. This is the story, if anyone can help it would be appreciated, although I think its not me. Prior to yesterday the EPG appeared to be OK.
I am in the UK, I have Sky Sports set up on the EPG. Yesterday I thought it would be a good idea to add some channels to my subscription.
Change channels, update subscription and update EPG.
Some new channels are there, but all of my Sky Sports channels are gone. I also noticed that I had all BBC1 regions although I had not specifically selected the regions. This may be normal...
These are the things I have tried :
reboot ipronto (10 times at least)
revert to channels that I had to start with
start new subscription with just sky sports selected.