Thank you a lot for your effort, guys. But the issue is solved. I just deleted my whole vector maps folder and let Locus create a new one, put any of the openandromaps files inside and it works again.
I have no idea what the conflict might have been, there were no overlapping areas in the file (to my knowledge except for the experiment trying it with the separate Saarland and Rheinland-Pfalz file).
But all the other vector maps from areas I barely visit (only during vacation or while flying over them by plane) have been outdated for a long time and I'll just update it.
I have no idea what the conflict might have been, there were no overlapping areas in the file (to my knowledge except for the experiment trying it with the separate Saarland and Rheinland-Pfalz file).
But all the other vector maps from areas I barely visit (only during vacation or while flying over them by plane) have been outdated for a long time and I'll just update it.