By jove I've got it werking... 
In going through it line by line to address my new image slots I detected two major faults:
Cargo bays had 2 effects stated, but only one in use (cargo tonnage).
I fixed that back to 1.
And I had a double-line at the end of a record.
I've reset everything back to level 1 and it's working fine thus far (with game reloads, I've not yet tried starting a new game).
If starting a new game works, I'll go back and start tinkering with the levels again.
Wish me luck!