Today, before setting off, I changed frequency down 0.1MHz and back again. The AF Debugging display changed to "Insufficient AF information; WAIT" - and stayed like that for the entire journey. Again, no retuning - it doesn't even fall-back to the 2.0b13 method when the signal gets low. Still not quite what I was looking forward to...

Also, muting the player or switching to MP3 doesn't seem to help - I thought that might give the radio more opportunity to sample the AFs, but it doesn't make any difference AFAICT.