I had the same issue. What worked for me was changing my time settings. Somehow, it had gone back an hour - I suspect something to do with daylight savings - but if you put the time correctly the TV guide is back to normal and all works. Explains why the TV guide and live TV was affected.
Hope this helps some of you!
Thanks, it's been driving me mad! Even logged it with NowTv Technical which didn't know how to fix it.
I just changed the time manually to Portugal time and TV Guide started working.