Running Windows 7, IE 9, and used to have Norton 360. When 360 subscription expired, I removed it from my computer thru the Control Panel. Also seems problems started with the New Mail. My attachments (pdf & word) began loading slower and slower to the point they quit for the most part. Give me an error message: "! An error message occurred while uploading. Dismiss - Remove" No other options. Attachments will load maybe 1 out of 8 tries, but not always. Last attachment is a Word file and is only 1022.6 kb's. Most others are under 4 mb's. Have Wi-fi, but took computer to a Computer Shop with dedicated I/N service/signal and did the same thing. They believe it is with Yahoo itself. Again, problem is with UPLOADING an attachment. Incoming open just fine.