Double brackets become double parentheses

Hi,

Since this morning I experience a curious behavior under windows (I don’t have the problem under linux). When I type double brackets quickly to insert the reference to a page, it turns into a double parenthesis.
Instead of having this [[]] I get this (())]]
I tried to deactivate all the plugins but it doesn’t change anything…
This is very very annoying. Do you have any idea where this comes from?