[_1SMV_Gitano]

@aj906: have you tried these trick?

EDIT: for those still having problems, please try to follow this procedure:

1) Install Freddy's Mod (whatever version);

2) Install Jabo Mod (e.g. MODS\BF-109F_Jabo\etc.);

3) Delete the MODS\Bf-109F_Jabo\3do\Cockpit folder;

4) Make a copy of hier.him file from Freddy's mod and rename it BF-109F2B.him ;
DO NOT DELETE original Freddy's hier.him

5) Open BF-109F2B.him and find the text section named [Z_ArmorGlass1]

6) Delete Hidden word

[Z_ArmorGlass1]
Mesh Z_ArmorGlass1
Parent _ROOT_
Hidden -----------------------------> delete this one
Attaching 0 1 0 -1 0 0 0 0 1 -0.26209 0 0.74628

Save and close file

This should work.