Highlight group exists but no highlighting

I am having syntax and highlight group put to the bottom of my
~/.vimrc file.

syntax keyword UserKeywords Samkit CHECKME REVIEW CHECKME
containedin=ALL
highlight def link UserKeywords Todo

This works fine if I open an unnamed file like just "gvim". But if I
open a file "gvim 1.c" then the above highlighting does'nt work. To
get it working again I have to manually source the ~/.vimrc file.
(tried without containedin too)

I am suspecting that something is calling "highlight clear" but I am
not sure of this. Additionally after opening 1.c I checked if my
syntax group exists and it exists so it can only be the work of
"highlight clear".

:hi UserKeywords
UserKeywords xxx links to Todo

For this much highlighting I would not like to create a new
runtimepath/after/syntax/default.vim containing above syntax+highlight
group commands and then source it for every BufRead and FileRead.

Also, along with any solution which you may suggest, I would really
like to know how to debug this.

--
You received this message from the "vim_use" maillist.
Do not top-post! Type your reply below the text you are replying to.
For more information, visit http://www.vim.org/maillist.php