You need to install EJB3 RC8 into JBoss AS.
I am busy getting CVS ready for the final release.
Thanks Gavin. I did this (it was a bit fiddly!) and everything is fine again. I'll hold off on another CVS update until you've finished what you're doing.
As a warning to others watch out for changes to InvocationContext. I was using this in a custom interceptor adapted from the Seam examples.