Bad assumption. Merging three code-bases will
always be subject to human error so ...
Para 3 under Support in the main post of the
combined DLL thread ...
"Any problems found in the combined DLL with features of individual mods MUST be tested with only the specific mod enabled before being reported as a bug. That is, if you find a problem with vassalage (say) while using the "DLL - Various Mod Components" mod, you MUST re-test with only the original "Civ IV Diplomacy Features" mod enabled before reporting it as a bug."