Seems that if you use the same route name as the filename of the fpl, then it mostly works but using the XXXX-XXXX-date format can result in screen going grey and machine hanging.
I have since updated my 496 to latest firmware and installed latest USB drivers and taken Garmin advice not connect via a hub but directly to USB bus at rear of PC. May be working better .. will have to test some more.
But, since you introduced the ability to rename the route, have you changed anything else to do with exporting to Garmin?
Any comments and experience from the SD team and fom other Garmin users wd be much appreciated.
D