Avatars and group-picture are not diplayed

I use the testversion and need to buy the full version. But I have the problem, that the avatars of the users an of the groups are dont displayed. Is this only in the testversion and the problem is solved when I buy the full version? Or is it a bug? If it is a bug, what can I do?
You can see the problem here: https://forum.wpde.org/attachments/buddypress/10100d1406011218-einige-avatare-werden-nicht-immer-angezeigt-2014-07-22-08_39_28-stadtp.jpg