My Halfling Domain's gone. The Item with is says the "You call upon Halfling Subtlety, but nothing happens, and i can't use Cat's Grace. Might be with other EfU Domains.

Can anybody else confirm this bug?

If nobody else can confirm this bug, then it's most likely just an issue for you. Try re-downloading the domains 2da file. If that doesn't work, get a DM to take a look at your character.