For the past couple weeks or so, whenever I vote on a question, I get a yellow box saying that an error has occurred and I should try again later. However, the vote is registered despite the error. This doesn't happen on voting on answers. Also, apparently it only happens under Chrome (Win7) - not on Firefox. Anyone else experiences this? Is this a known problem?
Haven't seen any other reports of this. Have you tried clearing your browser cache?
There are some fairly serious new caching bugs in Chrome 11 and onward.