I do have the very same issue, but not with the French Bush Trip but with Perfect Flight France and Benelux. I wanted to start the leg from Houssen.
Another issue is the (VFR!) flight starts at night.
I can switch to day using an instructor station (FS-FlightControl) but the Navlog is still empty. I had this already yesterday and repeated the previous leg using a set of saved files from the MISSION directory. This way, I was able to repeat the leg to Houssen. However, when I wanted to start from Houssen today, the Navlog was again empty.
I opened a ticket with Perfect Flight, but I am afraid the issue is with the base Simulator.