I'd have to say no, I didn't know from day one. Even though I know that will make me look really naive what with the post on Cyranoak's thread about the first time meeting him he was sh-tfaced drunk.
(clarification: XAH that is - not Cyranoak )
Didn't even cross my mind the first time he fell out of bed and nearly cracked his head open on the night stand (right after moving in with me - bringing a grand total of 1 duffle bag and 2 milk crates into the relationship, I might add) because he'd 'taken cold medicine and hadn't eaten.' Y_e_a_h_. I was pretty clueless.
I see a lot of red flags looking back.