Today I ran into a problem I haven't seen previously at BBO. When I logged in at around 2 PM central time, the number of people playing was around 42K. I clicked on the People tab and made sure that the three friends of mine that I wanted to invite to my table were online, i.e. listed in the Friends list. They were. When I clicked on the Casual option, immediately my friends disappeared from the Friends list, and the number of People playing, displayed above the People list dropped down to 12K. When I hit the back button, the friends showed up again in the list, and the number of people playing reverted to 42K. I was not able to start a table and invite them - the site displayed the error message that the people were not online.