So someone was selling dozens of green and red shards for 1 Crown each. I went and bid on all of them, actually won a few too :D But now if I go to the Bids tab in the Auction House interface the client will become completely unresponsive after about 10 minutes. Eventually I'll get a Java SE crash notice and an option to close Spiral Knights.
Actually, every time I get an outbid notice the client will freeze for up to a minute while it is reloading and redrawing the list. If I get one outbid notice after another it'll just stay frozen the whole time.
Fortunately this is quite an edge case as I rarely bid on 100s of items at a time, but it is hard to pass up a steal.