I have Fritz 13 and I haven't seen that when I do a full analysis.
In my settings I turn off all coaching and helping from Fritz. I've never seen Let's Check! mode.
I hate all that stuff.I hate it when Fritz starts playing a Blitz Game with me. I hate that whistle which blows when you make an illegal move. I hate that New Variation/New Mainline dialog which appears when you want to look at a move not in the current game.
The default options on Fritz are terrible for me.
When I play an interesting game, I import it to my Fritz 13 and leave it for full analysis (or so).
When I come back later, the Fritz, having done the analysis of my game, has cheekely decided to lose all the analysis (that I haven't saved) and is analysing some Let's Check! positions...
I can't find any settings menu where I could fix this really annoying thing (waiting for an anaysis for an hour for nothing). I also couldn't find any help from the manual nor by googling about the issue.
Is there any way to block the Fritz from entering the Let's Check! mode? And is there any way to restore the analysis before entering the Let's Check?
Any advice appreciated!