In Windows Live Mail (Windows 7 Home reium) , in the Signature window,  I've put in 4 different signatures and I like to pick different ones for different recipients.

There's  the option of choosing one as the "default."  Problem:  After  I designate one signature  to be the default, it won't " stick" . The next email I send has a different signature attached. Frustrating! I've re-done this a number of times and it just won't "stick."  Suggestions?