Are you talking about the A-4E (Late)? Pull out the A-4E .lods from the ObjectData.cat, and place them in the A-4EL folder, which means that I replaced the .lods that came with the A-4EL file with the TW A-4E, it worked like a charm (or was it supposed to..). Make sure point your A-4EL.ini files to the right .lods (or skip putting the .lods right away, just point the main .ini to the .lods). The same fix MIGHT be useful for the other A-4 mods out there, I have yet to try...
Is it because of the updated ObjectData.cat? Probably the same kind of problems associated with some of the MiG mods after updates.
EDIT: Take note of these in the A-4EL.ini:
[LOD001]
Filename=A-4E.lod
Distance=100
[LOD002]
Filename=A-4E_lod002.lod
Distance=250
[LOD003]
Filename=A-4E_lod003.lod
Distance=500
[LOD004]
Filename=A-4E_lod004.lod
Distance=1000
[LOD005]
Filename=A-4E_lod005.lod
Distance=8000
Try using the ones in the ObjectData.cat, they work.