Had the same problem today with win 7 media centre.
Was fine over the first re-tune a few weeks ago but just went in today to re-tune after the second to find everything gone.
WMC couldn't find any tv signal (or so it claimed).
Tried it twice and nowt.
Re-booted and re-ran it and it was fine.
So suggest you keep trying.
Oddly, I also recalled some friends with a panasonic tv saying they had to run auto-tune on their tv 3 times before it found anything - I didn't believe them at the time :)
Thursday 28 June 2012 1:59PM
Had the same problem today with win 7 media centre.
Was fine over the first re-tune a few weeks ago but just went in today to re-tune after the second to find everything gone.
WMC couldn't find any tv signal (or so it claimed).
Tried it twice and nowt.
Re-booted and re-ran it and it was fine.
So suggest you keep trying.
Oddly, I also recalled some friends with a panasonic tv saying they had to run auto-tune on their tv 3 times before it found anything - I didn't believe them at the time :)