I just read about the problem on a RocketTheme Forum post.
It seems to be a problem with the Gantry code, that conflicts with the Joomla lightbox core code, something I understand OSToolbar uses. From what I understand, the RocketTheme developers are looking into this.
Hope that helps.
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1 year 4 weeks ago #46683
Actually, it's not an issue with OSToolbar but rather Gantry's code so they'd have to get it fixed in their code.
Please go to plugin manager and search for "System - OSToolbar" and disable it for now. RocketTheme's Gantry Framework has a bug in it that conflict's with Joomla's modals, thus making OSToolbar and Gantry conflict.
Our subscription ran out to RocketTheme so I can't see if they replied or not.