screen not updated after backspace

Hi There,

since about a week on my server vim behaves strange. The backspace-key
is working correctly beside the fact, that the deleted characters are
not removed from the screen. Only when leaving insert-mode or switch
lines the screen will get updated and the deleted characters will
vanish from the screen.

e.g.: when backspacing 5 characters and typing 4 new, the newly typed
chars will be shown correctly, but the first backspaced char will stay
again until i leave the insert-mode or navigate into another line.

This is something which just happend one day to the other. Moving my
~/.vimrc file and my ~/.vim/ folder doesn't help, so i assume it's not
a missconfiguration of mine.

Version information:
Debian Etch, 64bit
Vim 7.0.305

Anybody a idea, where these odd behavior may come from?

Thanks in advance,
Sven

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