Mike - AA1AR
I'm having the same problem. The AFC box's setting is definitely NOT being retained between operating sessions.
Mine is in “Standard RTTY”.
Here is an additional observation:
If I exit WinWarbler while it is in RTTY mode (with AFC unchecked),
AFC will be unchecked the next time WW is started. If I exit WW in CW or SSB mode, then restart WW, then double-click a RTTY
spot in SpotCollector, WW will change to RTTY mode and the AFC box is checked.