After a seemingly successful upgrade to 1.6Q on i386, I'm unable to su 
to root.

root can su to others but others can't su to root.

I believe I noticed this even before updating the userland. Once I put 
the kernel in place this problem showed up. Of course updating userland 
didn't fix it!

I'm quite sure this is a simple config problem, but can't seem to find 
it. Any ideas would be greatly appreciated. Regards,

Louis