Folks,

It looks like #perform:withArguments: is severely broken in the latest (3.7) 
VMs. When you do something like:

     3 perform: #zork withArguments: nil.

we get an error complaining about "selector must be a symbol" which 
(interestingly enough) is being raised in class Symbol (via #zork). 
Something is horribly broken here - it looks like the primitive is messing 
up the stack when it fails.

Cheers,
  - Andreas

PS. Bert - can you add a "VM" category to Mantis?