crash with name change of faction

[Gigantus]

I have got a mod that runs without a problem. Yesterday I decided to add one more faction and proceeded as usual (Backing up the working mod before that).
At the splash screen I get the 'unspecified error' and CTD.
Not deterred I restored to the working mod and decided this time just to change the name of the faction. (did a search with the faction name as a phrase).
I went through the find and replace routine (avoiding the obvious pitfalls like changing the texture name instead of the faction)
At the splash screen I get the 'unspecified error' and CTD.
Now I am getting c(f)urious. Restored everything back to working and changed only the faction name in the descr_sm_factions.
At the splash screen I get the 'unspecified error' and CTD.
I had removed the Aztecs faction for the working mod so on a whim I renamed the faction to 'Aztecs'.
No error. Hu? There are no supporting files!

What the heck is going on!

Oh yeah, I have already re-installed once. And it is for a kingdoms mod.

[Gigantus]

I am getting old: forgot to edit the expanded.txt file.

Another tidbit:
if you haven't got a stratmap character for a faction in the descr_character file you will get a message with 'wrong gender?'