I don't "Import" from MRA, I "Export" the route, select "Drive" app to open the route and hit send, the XY then reports receiving the route and calculates it, to use it I have to go into the Trip Planner where it shows up as a "Saved Route"
Apart from the GPX 1.2 debacle this has always been fine, and MRA confirmed there might be trouble when using GPX 1.2 on the Zumo, as did Garmin - hence I don't even bother now, 1.1 is pretty good.
I set my stops as "Via" points and everything else as a shape, this gives me flexibility to shortcut to any Via point eaily, to use the Via point time / distance option to see how long until the next stop etc.
As my current Drive App version now works I will just leave it set to not update, and hope they reverse ths debacle before I need a new phone, but have the Installer file for this version as a backup - but it is a PITA to install that way.