Windows Live Mail – Catagory bug

I am running windows 7 Premium version 6.1 *Build 7601: Service Pack 1),

and use Windows live as my email tool: Windows Live Mail Version 16.4.3508.0205 *

I have downloaded the latest windows essentials,

I am current on all  Windows updates

My PC:

2.40 gigahertz AMD Phenom 9750 Quad-Core

8192 Megabytes Installed Memory

I have several hundred contacts, so I have set up categories. 

I use my Hotmail as my mail email default program, though, I do have other email accounts in Widows Live:

I have found that the category tool does not work the same each time I log on. when I add my category to my email TO:  box and hit the "+" sign, I get only a few, the first 8 to 10 names in my category ( my category has 48 names) 

If I reboot, and then I find that it only shows the last 8-10  of 48 names in my category, different than the first time I logged in?

When I  check the contact list the category shows all 48 names.

I have read thru all the comments in your forum and I do not seem to be alone in this issue.

I have also tried your suggestions of uninstalling, and reinstalling the Windows Live tool, as well as using the "repair" process in the uninstall/Change box in Control Panel.

I have also found that if I use the Admin, Task manager, and shut down windows live, on occasion, it will resolve the issue, but only for a little while.

I use this as a business tool, and am very frustrated, this seems to be getting worse, not better.

Thanks for any help

David