Been playing v3.0 and am now downloading v4.0, I must say that your skins are simply works of art.
One thing though, and this may be a bug... I've been playing the ERE (v3.0) and when I build an Auxillia Barracks in some regions (i.e. Constantinople) I get the Foederati line and the Auxilia Illiricani, but when I upgrade to a Comites Barracks I couldn't recruit these units anymore?
Certainly it would not be a big problem to limit construction to Auxillia Barracks in some territories if I want these units, but I would just want to know if this was done on purpose.