I think this is the recent change whereby PM history going back over a certain timeframe is retained after you leave. Previously any history was lost when you left the room, or even refreshed the window.
So now when you visit a room you've been in before, you can resume sending PM's with anyone you have a PM history with in that room. Plus send anyone else in the room a PM if you are a mod, fanclub member or site supporter (by subscription).
But going into a room that is new to you, or you've been in before but earlier than the retained PM history lasts for, you can only send a PM if you are a mod, fanclub member or supporter.
But as Billy wrote above, maybe it is now working slightly differently again than when the PM chat 'update' was introduced recently......
I'd guess in the example above, the light blue user was a site supporter. Definitely would report their message as spam.
So now when you visit a room you've been in before, you can resume sending PM's with anyone you have a PM history with in that room. Plus send anyone else in the room a PM if you are a mod, fanclub member or site supporter (by subscription).
But going into a room that is new to you, or you've been in before but earlier than the retained PM history lasts for, you can only send a PM if you are a mod, fanclub member or supporter.
But as Billy wrote above, maybe it is now working slightly differently again than when the PM chat 'update' was introduced recently......
I'd guess in the example above, the light blue user was a site supporter. Definitely would report their message as spam.