Have not played extensively with the settings, so I apologize if this is an easy setting adjustment - iFly is panel mounted and I forgot to bring it home to play around.
 
The issue I saw on my flight last night - only since using auto-taxi , which is great BTW! - when the iFly transitions from the airfield pic/diagram, it always switches to the vector map at the lowest zoom scale 1.  Would assume that it would/should revert to the last mode setting used (ie sectional 4xzoom).  Wondering if anyone else has experienced the same thing?