marks not being saved

[myglc2]

My marks are not begin saved. 

Here is what happens:

1) I tick '!' article A in a gmane summary buffer

2) I go to the Group Buffer and save 's'

3) I exit and reopen emacs

4) There is no tick '!' on article A. I assume there should be, right?

Can anyone suggest what I might be doing wrong?

TIA - George

Using:
 Gnus v5.13
 GNU Emacs 24.5.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.14.5)