Every time I launch iTunes, I have to Turn Off, then Turn On, iTunes Match

Hi,

When I launch iTunes, while all of my Match songs are listed, I can't play any of them. Right-clicking on a song reveals that the "Play <song name>" context menu item is grayed-out.

The only work-around I've found is to

1. Turn off iTunes Match
2. Turn on iTunes Match, entering my Apple ID and Password again.

While this works, it is slow (it has to re-download my Match database each time), and kind of annoying.

Any help would be greatly appreciated.

Thanks.