The info is coming from the scanner. Try turning on the option "Scanner Data To 'Scanner Data.txt' File" so when this happens again, look at the Scanner Data.txt file to help determine where the problem is. Option is located in the Options - General tab.
Hi,
Thanks for getting back so quickly.
I have done that, and here is the first result. I didn't manage to screen grab it when it happened, but the scanner screen and the Proscan image of it both had the same (correct) system-group-channel displayed for for 124.275 (which corresponded to the scanner data.text log entries), but the grid (highlighted in blue) and the history log do not.