I have downgraded to 1.03. This seems to have fixed everything; I can alter the contents of my player again, and the interminable in-car database rebuilding is gone.

Ah, good. You might be OK to upgrade to 2.0b7 again at this point if it has some features you can't live without. If you run into trouble, you can always drop back to 1.03 again.
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Tony Fabris