Prolly due to the forum move. Someone said it was gonna get fixed, but I donno.
There's prolly a work-around to it, but I don't seem to be having the issue, so can't help much.
As Aoife said, the forum recently got moved. As part of the move the internet address (URL) of all the posts must have changed. The search feature uses Google and Google's little bots probably just haven't noticed the move yet. So right now Google is still referring people to the old web addresses that it has on file.
it just takes Google a little bit of time to notice new web addresses. Once Google notices the new addresses and updates it's listings, searches will work fine again.
Oops! It looks like the Google bots have already caught up. I just tried a search and it worked.
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