dasBlog - Password Challenge was null in ViewState

Was having trouble logging into my dasBlog and after a bit of searching around and finding this at the DasBlog forum and this, realized the problem might be with my web.config file.
And sure enough, found this in the web.config:

NOTE: If you want to run MULTIPLE dasBlogs on the SAME Domain Name include the path in each blog's Web.Config like path="/dasblog1" and path="/yoursite" as appropriate.

Made the necessary changes in my web.config and the blog is working fine again.