default key bindings (with control modifier) not working?

[laputa5]

Hi,

I'm new with Emacs and vimpulse (Thanks for this wonderful extension!). 
Sorry if this question has been answered somewhere or if this is not the 
right place to ask.

I have Emacs 23.3 and the up-to-date vimpulse. It works great except 
that all the default key bindings with the control modifier don't seem 
to work. i.e. in vimpulse-misc-keybindings.el, key bindings like these 
are not working,

(define-key viper-vi-basic-map "\C-]" 'vimpulse-jump-to-tag-at-point)
(define-key viper-vi-basic-map "\C-t" 'pop-tag-mark)

 >>> (describe key gives:  C-t runs the command viper-nil)

or

(define-key viper-insert-basic-map "\C-p" 'vimpulse-abbrev-expand-before)
(define-key viper-insert-basic-map "\C-n" 'vimpulse-abbrev-expand-after

 >>> (describe key gives: C-p runs the command self-insert-command )

If I rebind them like this, they work,
   (define-key viper-insert-global-user-map "\C-p" 
'vimpulse-abbrev-expand-before

Also the default key bindings from viper mode (not vimpulse) don't have 
any issue (e.g. C-c, C-h, C-b, C-d, ...).

What's missing?

Thanks.