I'm finking something isn't installing or moving right when moving these maps, make sure are replacing files when placing into exports. If you are using primarially exports, maybe switching it up to the terrains folder for fhm. files and my objects for fho. files may work for you. May work vice versa.
I tried to paste the .fhm files on terrains and .fho on my_objects, but I crashed as usual anyway. :x
Maybe you have FH installed in a compressed drive? is not common but can be a reason.
I got out of ideas really. Put more details about like:
-what maps have you downloaded?
-what operating system are you using?
-it crashes even if you install only one custom map? or have you put a lot in fh at same time?
Maybe a reason are maps who are using objects groups like MyPlants.fho, MyRocks.fho, etc. they get replaced frequently by another map download and can cause problems.
Actually no, I didn't install FH into a compressed drive. :/
Alrighty, adding more details.
1) I currently have two maps: DaburiPridelands and Jirakeebeach.
2) I use OpenGL. As I said on the first post, the maps work when I switch to Direct3D, but all the floor turns into savannah grass, even maps such as fluorite and ficho tunnes.
3) It doesn't work even when there is only one map on the Exports folder.
I hope I made things a bit better now. ^^