I did a complete system clean and reinstall of EQ2.
I downloaded Henchman and added the Henchman version of eXtreme to my favorites.
Henchman downloaded eXtreme and I installed it.
Now all the windows in the new release are a bright white background... (Every window that is supposed to be transparent at least) except the inventory. The inventory is the old grey color.
So I erased my custom UI folder and uninstalled Henchman. I then erased my EQ2 folder and replaced it with a back-up I made right after re-installing EQ2.
I then downloaded the AUCP version of eXtreme and installed it... And it works perfectly.
So something is wrong with the Henchman version on at least my system.