German Umlaut "ä" not working

Dear Vimers,

I experience a strange behaviour in Vim.
I cannot type the German-Umlaut "ä" any more,
while the other two Umlauts still work.
This is only true, if I start vim with my .vimrc,
loading my plug-ins using pathogen.
If I start vim with
vim -u NONE
the Umlaut works.

As I haven't been writing German texts in a long while,
I do not know, which of my lately installed plug-ins causes this.

If I review ma mappings with :map the first two rows show:
"
s ä @<Esc>ä
n ä *@:exec 'silent! normal '.<SNR>40_SwitchRegion()<CR>
"
Could that be the cause of the problem?
- But doesn't the "s" in the first row's first column mean,
that this is a select-mode-mapping?

How do I know, which plug-in defines the above mapping.
A grep -R ä * in my plug-in-dir yields no results.

Please help!
Kind regards!
Asis

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