Hmm, that got rid of most of them, now I'm left with a few pieces that I can select, but 'delete' doesn't work on them.

I can drag a rectangle around them, and they briefly select then deselect. But once I drag the rectangle, then I can click select them. Delete though doesn't work, nor can I move them.

Oh, wait, they're selected by the window, but don't show as such. Then ops work. If I click on them, and turn them yellow, then no ops work on them.