Haha, we were working on it at the same time! I just came to the same conclusion, BGL_9 solves the problem!
Interestingly, the BGL_10 also seems to work without CTD, although I flew the mission with this one installed only once, since the BGL_9 has all the objects.
However, I also have another issue not related with this one. There is a strange "shadow" on the east side of Valetta, see attached picture:
And, when I fy close to Hal Far airfield, half of it disappears behind the ground texture. When I´m farther away the whole runway complex is visible:



I saw on one of the previous pages of this thread that other members also had this issue and apparently there is no real solution for it. The funny thing is, it used to work on my install, and only yesterday I suddenly noticed that the problem was there.
All I did was swap valetta BGLs for the testing of the CTD issue, so I don´t understand why this has come up now.
For me it is no problem at the moment, though, because the missions I have in mind are German, so I won´t have to land there, and from a distance everything looks normal. I also can live with this shadow near Valetta.