When i had Mo Creatures mod installed (and other mods) in 1.6.4 I could click on a button where "Mod Options" is now (think it had the same name), and get into a menu with various installed mods with configurable settings. On of those menus was Mo Creatures Mod. From that menu I could configure a lot of aspects about this mod, and access some other functions like limiting the number of mobs, spawning some mobs...etc.
Now when I click on the "Mod Options" button i get sent to a menu that says:
"Test 1
Test 2
Disabled"
And I can do nothing from there. There is no way for me to access the mod configuration settings, and a lot of them aren't configurable outside the mod, in the ini files. I'm running minecraft 1.7.2 , and also have Optifine, but I doubt that is the problem. Optifine's buttons are all working properly, in the video settings.