Aaaah!! I had this problem a while back... Ebay went all cranky on me also.
Someone ( i cant remember who, but i thank you) on this forum came up with the solution. I think all i had to do was clear my cache, turn comp off then on again and all was back to normal
i thought maybe it was because i was using firefox, but the same was with Internet explorer and then i thought maybe it was this computer, so i tried it on my other computer and my ipod touch and my missus iphone, all the same thing. i didnt say anything earlier to be honest i was waiting for some one else to bring it up if it was an issue every one was having, because its been a week and no one else said anything i thought i will ask as maybe the issue wasnt seen by every one. id really love to find a solution to this cheers