It loads OK in DBW, it is not loading in 1916.
I don't know why, but, in the log file, it was trying to load a map that does not exist.
For some people it loads OK in 1916, so maybe the last time they flew in DBW QMB, they may have chosen a map that exists in 1916.
I don't know, maybe...
CirX made me note about this subject. Basically there is one problem: QMBPro (as the stock QMB 4.10 which implements the same I was doing before in previous versions of QMBPro), records a mission with the last flawn data. This file is called .last.quick and is located in [Root]\Quicks folder.
What happens, if you switch between a DBW installation which loaded tens of maps, and a lot of airplanes, and the last QMB mission you played recorded the use of a map (and more probable a plane) that doesn't exist in the DBW1916 set, when you switch to it, the .last.quick file will be specifing some inexistent planes / maps information, because it comes from a different set.
Easy workaround: delete the former .last.quick file! The game will start with a blanck QMB mission but will start OK, and since then you can work normally. YOU WOULD NEED TO DO THE SAME WHEN YOU COME BACK TO DBW.
This is a new problem derived from a behaviour (the switching between configurations) that we didn't have before. For the near future I will implement some code solution for it.