Vim tip: arrow keys print ABCD?

VIM 方向键在编辑状态下是ABCD?

I have just build vim7 and found weird when i pressed arrow keys in the Insert mode, the cursor didn't move but printed A, B, C and D. And the -- INSERT -- doesn't show up.

As soon as I introduced the ~/.vimrc, although with no contents in this file, the problem disappeared (under ubuntu).

for more information：
Arrow keys/cursor movement prints A B C D letters

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