Looking through my collection of your units (I have all) I notice that the most of them have this "little problem" within the units_32.pcx file.
Sorry if you allready know this!!! BUT HERE`S FOR YOU MY
Mini-Tutorial: "How-To-Make-units_32.pcx-In-CIV3-Color" by General 666
1. Make a copy of the original
Units_32.pcx. (Much Needed Safety Step (Believe Me!!!))
2. Load that copied version into your GFX-Prog for .pcx-files and shrink the whole thing to "32 x 32 Pixels". (Now you got a little funny pic)
3. Load the pcx-file you want to add (most times it will be your units_32.pcx created with FLICster I guess).
4. Copy/Paste it into the shrinked copy of the original C3C Units_32.pcx.
5. While the picture/window still activated choose "SAVE AS" and save under desired name.
Do only these steps. Especially DON´T change the palette!!! And that`s It! Your Done!
The whole procedure cost me under half-a-minute.(Seems not to work with these PediaIcons)
Me using this for years and hasen`t got ever any problem.
Another possible way: (I NEVER DONE THIS)
Just load the palette of the original file and save it to the desired file.
But I don`t know if it works. I will verify this in the next time.
All this is meant to make you more autonomous in future.
Awaiting the promised unit!