Thanks! That's going to save some time.
I did notice the queue repair page after I'd already re-added all the NZBs, so I left it alone — wasn't sure whether it was possible to repair after I'd already re-added everything. Still, useful if anything goes wrong again...
Wish I'd noticed the multi-operations option before I'd done about a third of the queue by hand
(Incidentally, it might be an idea to change the "Apply to Selected" button on click so that it looks like it's been pushed — the only indication something's happening is that the browser status bar now says it's loading items… also, on Safari, the active area only appears to be about the right-hand third of the button!)