Hello and thank you for letting us know,
They discover that when switching joomla to the default and ugly admin template, K2 seems to work again properly.
Is this issue present without the JA-Social template, if yes please provide some screenshots and let us know which other extensions you are using so we can try to reproduce the issue.
If not, then this is an issue on JoomlArt's part since it it their product 'breaking' the admin view.