The popup when you start or load the game says 18? Which version of the mod do you have?
Also, if you press Ctrl-Shift-X and then click OK on the popup, does it correctly automate for 10 turns? I have a hard time imagining how you could get a max of 18 with a functioning copy of the mod, my guess is the DLL is incorrectly installed. Has to be named CvGameCoreDLL.dll in the Revolution/Assets/ folder.
I noticed an error with the Leadername system, in the event where there is no unique new leader. I had a custom name for a custom civ, which used by own name, but when the population asked for an election, which I lost, my successor reverted to the normal name. When I regained control, this name sticked. I had the same situation occur again, and as Roman numerals were at the end of this name, I had a sort of heir situation, the XII becoming XIII. It didn't go any further, thankfully.
I just installed the mod (first time playing it) and it worked fine until I tried to build my first city. As soon as I pressed <B>, it quit and gave me the windows "CivIV Warlords has encountered a problem and needs to close. We are sorry..."
I tried three times and it did the same thing each time. Any ideas?