Selecting uncommon items result in showing up rare ones, and when you select rare items, very rares show up. So in fact, you cannot select uncommon items now. Common works as usual, while very rare doesn't give any result.
You can still find Uncommon items if you select the Any Rarity option, but it is a bit of a nuisance.
That said, I started a search for an Engineering Booster console for price checking so I could post mine for sale, and the server stopped responding. After I reconnected, I've not been able to perform searches at all. If anyone else is seeing this problem, maybe a fix is already in the works?