Trouble with Grasshopper 8.05

I'm not sure whether this is a problem unique to me, but after updating to the newest release of grasshopper my Kangaroo tools stopped working-- no "Extras" in the toolbar and error messages when opening files.

I tried deleting the kangaroo file from components and replacing it with a new one, but this did not fix the problem.

Just a heads-up... I'd love to know if this is a common problem, or if there is a fix.  Luckily I still had my 8.04 installer sitting in my downloads file, so I was able to revert without any trouble.

Mike