The linebreak option sometimes stops working in the insert mode

I use Vim 7.4.488 on Debian Jessie, and have a problem with the linebreak
feature (for not breaking words when wrapping lines).

The problem is only in the insert mode; normal and visual are fine. What
happens is that the paragraph reflows, as if I set linebreak off upon
entering the insert mode. I did a little testing and it seems that this only
occurs when I enter the insert mode to edit more than one character, either
by selecting a few characters and pressing "c", or by placing the cursor
above a word and pressing "caw" or "ciw".

When I run Vim normally and my .vimrc is sourced, it doesn't matter which
word I try to edit. When I run Vim with "-u NONE", however, it seems that
the problem only occurs when the characters in question would not reflow to
the first line, i.e. it will happen when I edit a word say in the third
line, but not with one in the first line or at the very beginning of the
second line, if it almost fits in the first one. I wasn't able to narrow it
down to a single setting in my .vimrc that might be causing this difference.

Is this a known problem, does anyone know how to fix it? Frankly, it's a bit
annoying.



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