Hi,
I had the same problem while uploading it just started giving me the error.
I changed my password and logged in again today but still getting the errors.
Before I contacted support I searched the forum and found out that I have the same problems: the upload permission error as described here and also the aditi website. Its only on beta grid for me because on main grid I dont get the errors.
So I voted on the link but isnt there a why to keep on testing my meshes before somebody fix that error??
BB