Just a heads up/checking to see if this is happening for anyone else, but I'm currently unable to access iTunes Match libraries on the latest iTunes 10.5 Mac beta. I'm getting "We're sorry, we cannot complete your request on the iTunes Store at this time." Before I get the trumpet of "Its beta, deal," I understand that, and I'm not complaining or asking for help, just wondering if anyone else is noticing this issue. iOS 5 loads it just fine, so I'm thinking it has less to do with iCloud and more with a new iTunes for Wednesday's releases.