On one of my Premiuum groups I noticed that my message scroll referted to 20.
When I checked my account it indicated I had it set to Infinite.
I set it to 20 and it worked.
I set it to 100 and it worked.
I set it to Infinite and it only provided 20. When I checked it it was set to Infinite.
I went through this procedure several times and had the same results.
Mark, the group is FuchsFriends