When creating new forums, please watch the permissions! By default, phpBB wants to copy permissions from the immediate parent forum.
However, all platform parent forums (Copter, Plane, Rover) are read-only, which means, if you copy the permission from the parent, no user will be able to post in there!
When creating a new firmware subforum, please select another existing firmware subforum as source for copying permissions, e.g. to create Copter/3.2, copy permissions from Copter/3.1 - not from Copter itself!