ha, ok ... lol didn't take long

just make sure you uncheck the the build, remove and reload edit buttons before closing the editor as they lock editing out when building navmesh to stop accidental movement of entities.
When unchecking the remove button, make sure you have remove tiles chosen from the arrow list.

This is a first version, so it is a bit rough around the edges. Next few versions will tame it.
I will get this sorted for the next release. I just built a work habit to avoid it when developing lol.
Hope this helps
