@tapioa) oki

works for me on Android too ...
b) thanks, the issue in "import dialog" fixed
The issue with the track preview has to be in the app ... probably since begin. As I wrote, it currently does not have known a simple solution to me and needs major rewrite of tracks-list screen ... later.
@Andrew HeardI've set export to directory Locus/export/test, then I've deleted "test" directory in file browser and then pressed "export" button. And no error, all went well. "test" directory was automatically created and inside is exported file. So please, precise steps or video needed if you want to fix it, thanks.
Interesting with route planner problem is that there were no change in the app. It seems to be some side effect. I'm trying to measure possible slowdown because even on my device it took 2 seconds and at least I see that no matter what happens, it block UI completely ... as you wrote. I've improved this at least.
Free & Pro simultaneously ... problem is in detection that something like this is happening. Generally in Android is nothing like "app is running" and "app is not running". Well, Locus Map tries to simulate this behavior, but it is more a hack then suggested method. So one app cannot simply say if any other application is running. And in case of track recording: current recorded track is save directly into internal memory to cache directory to prevent some possible loss because of unexpected situations. And this cache directory is shared between both versions. For most of other features, there should be no problem.
@john_percynono, MF4 library in Locus Map is used for 100% of map content you see. There are no my own inventions regards to how map or texts are drawn. Yes, only what I did were some small optimization to force side map tile reload in cache of overlaping texts. If this may cause these problems? Hard to say.
@Viajero Perdidoif possible, may you please try to test your map with the Cruiser application? I'm suggesting this because Emux who create Cruiser is current probably most active MapsForge developer. In case, same problem will be in cruiser as well (which I expect), it is more MF problem. Thanks.