Had the same problem. As far as it concerns me it started back with the HUD of the Hornet, which shows simlpy white and which took me to C6 to have the F-18BA (Blue Angels) from their MegaPack which is a upgraded version to fix this.
Hanging around with the MegaPack and the Problem with the ASS-38 still unsolved I picked the data from their weapondata.ini for the ASS-38 along with their ASS-38.bmp, .ini and .lod (which are actually two!).
Copy and paste (overwrite the old ASS-38.bmp) and it still works fine which means: it shows up in the table as well as on the aircraft itself!
Try it and you will love it! Maybe there are a lot of other issues which can be solved with the MegaPack from C6. Just have a look at it always you have this or that issue. It should fix it.