Question

For some strange reason ctrl-i/o combination to jump to previous/next location doesn’t work for me.

As suggested in the comment to OP
Jump with Ctrl-O/I doesn't work in my Vim

:verbose map <C-o> and :verbose map <C-i> gives me “no mapping found”.

How do i restore these key mappings ?

EDIT : This is my vimrc http://pastebin.com/bX2NkNgz

Answer 1

You should use

:verbose map <C-o>
:verbose map <C-i>

Or you can press C-vC-i and C-vC-o respectively

(if on Windows, you might need to use C-q instead of C-v)

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PS. Are you on windows? If so, try scrapping behave mswin and source mswin.vim and similar from $MYVIMRC. Restart