notice with 2.6.0b2 I have created my own custom group in Spark. I already had few shared groups automatically pulled from server in my roster. I have copied some of that shared contacts to my newly created local group (some sort of favorites). And i sometimes face a problem, that this group becomes empty (i have showing offline users turned on, and also grouping of offline users is turned off). I can try expanding and collapsing it to no avail. Other shared groups act normally. To fix that i have to relogin.