This morning I activated iTunes Match. There were over 20,000 songs to scan and upload, so I walked away and came back to it this afternoon. Upon returning, I found that iTunes had crashed. Now any time I try to open iTunes, the window displays but within a second (seemingly as soon as it tries to access iTunes Match, but I have no way of confirming that) it crashes. So I effectively can't get iTunes to run.
Has this happened for anybody else? Does anybody have any suggestions for fixing or even diagnosing this?