I am using Windows Live Mail on Windows ten and I have set up a category in my address book with a list of email address I often send emails to, i.e. a preset list.    When I set this up it worked find and I used it in Windows 7 before I moved to Windows 10.   Over the last 6 months it seems to work intermittently.   I can type the category into the To: box and it will come up and populate the box with the plus sign in front of it.    Sometimes when I click the plus sign it puts all the associated emails into the To box.    Sometimes it doesn't.   When it doesn't I can go back to the address book, look at the category and i will see all the associated email addresses listed.   However, if I go back to the email and try to use the category it doesn't work.   However, If I go  to the address book, click edit the category and reclick all the email address into the save box and go back to the email and then enter the category it works.

What gives?   Is there some way to fix this bug?