eBayers beware, recently a a flaw in the linking between PayPal and the online auction has been discovered. This particular bug could result in a sort of denial of service, with someone being unable to accept payment for an item. This comes right along with yet another, bug, one that could result in new auctions being unable to be created. Luckily, this doesn't appear to be security related - just a nuisance, although a particularly aggravating one for those relying on auctions.
Both companies are aware of the problem, and a pseudo "work around" has been made public, though it may not always work.