No,It didn't happen this morning .It happened yesterdy about 3 or 4 days out of the week.It makes me totally upset when it does it cause I'm lost then.I then start trying to find them.
If it shows for example 50 new posts and you click the button to view them they shouldn't disappear immediately. That is unusual behaviour. They should disappear after about an hour or so giving you time to view them. What browser are you using Glenda?
I forgot it signs me out of Stew a lot .I have sign in at least 2 times to get to read all.Of couse I loose all my posts again.
I suggest installing Firefox and report back to gnome headquarters in a few days. It sounds like you have a cookie problem. A change in browser could solve this.