I installed a new 1.7 site a couple of days ago and was using the Messages plugin which installs be default. Everything was working fine both email and chat.

Today I installed the latest Messages plugin update. Now only one or two names appear in the Chat contact list in the lower right-hand corner of the screen. The names one or two names appear consistently but vary per user account.

I tried uninstalling and reinstalling the Messages plugin with no change. I also tried friending and un-friending user accounts.

What is the query that selects the list of users to appear in the contact list?