I just tried the 1.4.1 standalone today. I too am getting the GBU-12 0 problem, although strangely you can see the bombs on the wings. seems an odd one.
I had the same problem with the bomb launcher error. I managed to fix it by putting the previous a10 mods back in my mod folder (EVEN_A10_Thunderbolt.pbo and EVEN_A10_ThunderboltG.pbo); I had assumed that version 1.4 was stand alone, but I guess not.
I'm using 1.7 beta.
Great work on the mod!