Re: disc won't authenticate

Shouldn't matter.  If you have both installed, either disc will allow playing either.

(Can confirm as someone with the retail discs of DAO, DAA, DA/UE, multiple un- and re-installs of same, and now the EA/Origin digital download install of them all!)

I never thought it made terrifically good sense, but that's how it was that first year. 

yes, this was it.  was being a complete idiot and using the wrong disc....in my defence the right disc was in another game box

thanks