I have almost the same problem as DZ34
Release Basecamp 4.7.0 Garmin 650 5.50
I wanted to have a new version of my maps on Garmin 650.
The maps are all ok on Base Camp. When I run Map Install all the maps came up in Mapinstall, and I can select for installation.
The installation run and finish with ok.
Al maps look ok on Garmin 650 card, I can make them active/deactive and the right map is selected, but no map details is shown on the Garmin 650 screen.
I have also tried it on a old map (earlier installations ok), but it is still the same problem.
When I run the map installation, I can see that MapInstall write installing indx' - it takes short time. But it takes almost no time in the end to install all the images on the map.
When I compare the size of the the files om Basecamp and Garmin 650 the size on Garmin is too small.
My only change is new versions on Basecamp, Mapinstall and Garmin 650.
Anyone knows what is wrong ? and how to fix it ?