Freaky update problem

I've been entering data all day and night, and there's one field that just won't maintain its changes. Go to the Vendors view in my Lists app, search for barnes, and click Edit next to Barnes & Noble. In the Logo Source field, paste the value http://clickserve.cc-dt.com/link/tplimage?lid=41000000014950200&pubid=21000000000010639 (it should all be one unbroken string) then scroll down and click Update. If you click Edit again the change wasn't saved!!! No error or anything!
maureenshea