Hello Steve,
I´m stil wondering that you got a Version 2.5.1 already in January.
I got here from Robbe in Germany a non released (Beta) Version 2.5.1 in May. I tested it an gave Robbe Futaba a report back becaus of our FEPC and FSS products.
This version had not the known issues we know from 2.5.0 in respect to the IAS and GPS Speed Display.
I´m still using the Version 2.5.1 Beta with my test models.
Unfortunatly I lost my contact at Robbe because Robbe went into insolvency.
Ripmax the new German Futaba Distributor released aprox. two week ago a now official Version 2.5.1 for T18MZ.
I would suggest in your case pull the now official released 2.5.1 and install it.
BR
Dirk