Same here.
"Start" grey. Relaunch the client (20 times already)
"Unable to update EU/NA". Relaunch the client (3 times)
"Error 10102" for several times (30-40 atm)

I am trying to barely log-in in the last hour, and every time an error, new one or old one, pop up. Now even the client give me some weird language error.

I shouldn't have logged out yesterday, so i could play today. I shouldn't even think about that, i know, but given my low free time windows, i can't enrage every time with the client of the game i love