Just gone to do some alterations to existing pages using DW8 (which I also used to create the pages) and those pages which use Pure ASP Upload are coming up with an error.

The error is:

Javascript error while loading Pure ASP Upload.htm
Internal error: can't decode JSPrincipals

Anyone know what this error is as the Pure ASP fails to load causing Smart Upload to fail too.

Problem averted, reinstalled extensions.