Just enabled iTunes Match. Win7, all patches and updates. iTunes 11.0.1.12. Relatively small library (~2700 songs). It matched all but about 25%, then got part way through uploading, reported error. I've disabled Match, removed computer, re-added it. Windows reports crash when iTunes finishes gathering info, matching, and then on start of upload of unmatched material. Have to disable match to not have iTunes crash on EVERY start.