Can't log in to iTunes Match from Mac
Hello!
Since yesterday, I can't log in to iTunes Match from iTunes on my Mac. I have no trouble at all from the iOS devices and I can even access the Store without problem: I have tried a lot of things: log out from my account, then log in, deactivate Match, then activate; unauthorize the computer, then authorize back, reinstall iTunes. I have followed every instructions from the Support section and nothing works. When I open iTunes, Match starts but keeps lagging on the first step, then stops, then starts again and so on...
Does anyone know what is going on and can I do, before using the backups from time machine?
MacBook Pro, OS X Mountain Lion (10.8.4)