(I don't know if this is the seam wizard or jboss as wizard failing...)
Pristine and new workspace
New Seam Project Wizard
fill in name
see it complains over runtime missing
create runtime for jb4.2 (for some reason the server is not created)
Create server - select jb4.2 and next ...I get a "NullPointerException" in a dialog - nothing in the logs.