viper-want-ctl-h-help broken?

[Michael Lee]

I recently upgraded to gnu emacs 22.0.50.1 (compiled for darwin/os x) 
and discovered that binding C-h to help-command (or just setting 
viper-want-ctl-h-help to true) doesn't work any longer for help queries 
of type C-h k (for getting keystroke help).  This happens when I'm in 
viper mode, irrespective of whether I'm actually in viper editing mode 
or have switched temporarily to emacs-mode (C-z).  I keep getting the 
error message "Wrong type argument: arrayp, nil" when I try to lookup 
any keystroke.  If I turn off viper mode with viper-go-away, C-h k 
resumes working properly.

Can anyone help to figure out how to fix this, or what I might have 
wrong in my configuration?

Thanks!

Michael