When I stop Locus Pro the normal way, it asks to stop and I acknowledge. Then the window closes and I quickly click on the app again: it then starts immediately (it does not read the DB and such), but incomplete: the right panel does not appear at all. This is 100% reproducible.
If I stop the app the normal way and give it enough time to really stop, then this effect does not appear.
EDIT: this is on a Nexus 5X with latest, Android March'17. All apps are also latest.