I reinstalled MyDrive, logged out/in, changed the cable, nothing is changing.
I can see in the HOME3\cache folder that the map is downloaded (I tried multiple versions of Europe with/without buildings, both are there) but seems like it's not uploaded to the device.
What can be done? As the PND is completely useless right now.
later edit: would be nice to have the possibility to download an older MyDrive, which didn't have this problem.
Best answer by morbidel
Issue got fixed after calling TomTom support. They provided me a list of potential issues, and the culprit were some ports which were used by another app. Be sure you have ports 80, 443, 3128, 3129 and 4000 free.