having trouble logging into websites
I have Mac Book Pro 10.8.4 and Safari 6.0.5. Ever since the most recent update, I have trouble logging into secure sites like Yahoo! mail, eBay to name a few. The login boxes are active but nothing happens when I hit the enter or signin button. It just sits there, it isn't hanging or anything like that, it's as if I'd hit any other place on the page where one wouldn't expect anything to happen. I can and do refresh the page, approach from a different "angle" (for lack of a better term, say from "sign in" instead of "mail" for example) and try again. Sometimes this is enough and sometimes it takes several attempts to get it to recognise my hitting the button. I didn't have trouble prior to this most recent update. Any help would be really appreciated. Thanks.
MacBook Pro, OS X Mountain Lion (10.8.4), Safari 6.0.5 (8536.30.1)