Hello,
I think it �s not a problem of the new server, since nobody else is having problems downloading (as far as I know).
Please, try this:
When you choose to download a worksheet, click with the right button of your mouse, and choose the option "Save Target As...".
Please tell me if this method works for you.
Concerning the uploading problem, please tell me what happens when you try to upload the ppt. Do you get an error message? If so, could you send me a copy of the error message?
Also, please send me a copy of the ppt file that you are trying to upload, to check if it is OK.
Thanks.