Well turns out this was a false alarm. For quite awhile now my wife, who does all the TV scheduling, has said that the guide only goes out a short time. She does everything in Theater View. I worked on things this morning in Standard View. When I told her I was working on the problem and made a Forum post she said that last night the Guide was again going way out as it previously did. I then checked things in Theater View and sure enough, about two weeks out. In Standard View it's still only a little over 24 hours though for some reason. Perhaps it's always been that way.
Cheers,
Rod