Well,
i tested the "T3 Engineering Stations FAF" mod and got the same error. (No unit icons)
This is because this mod is hooking some functions for its own icon display.
Badly those functions have changed inside the FAF game version and the mod-hooks are not working correct with FAF.
You could delete these files from the T3 Engi mod:
uiutil.lua
unitview.lua
gamecommon.lua
This will remove the mod internal icon display functions and FAF can display your icons again.