puzzling <C-K> to <t_<fd>`> expansion for rst files, no digraph

Hi,

just in case someone else has the same problem...

This happens (only?) with .rst file extension (restructured text):
In insert mode <C-K> gets immediately expanded to <t_ı`> (<t_<fd>`>)
Wanted behavior would be to let me enter a digraph.

I let vim list :imap. No such mapping.
I grep /usr/share/vim73 and ~/.vim for '<t_' and '<C-K>'. No explaining
result.
I check whether keymap files are loaded. None.
iabbr. None.

So I check every single bundle by mv'ing it to a temp name.

And, surprise, with css_color gone the behavior is gone.
<C-K> lets me enter the digraph now.

I checked css_color, but it didn't give me any hint
on how it could have produced the behavior.
I'm curious. So if anybody has an idea, please let me know.


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