I'm now getting more than just the last 5 message threads.  But I'm still not seeing contact names on multi-user threads.  Is anyone alse seeing this same issue?  I've tried clearing my browser data ... typical response for any issues with this messaging tool ... and no change. 

Still just seeing numbers for each of the contacts on a multi-user thread from the web app only.  Contact names show as expected on single user threads from the web app, and from all threads on the android app.