i'm not talking about the imageblock in xaraya.
go to g2's main.php or g2 in xaraya and click "site admin" -> "modules" and there make sure that the imageblock module is active. i'm talking about g2 modules, not the g2 module in xaraya.
and if it redirects to the upgrader...no idea.
go to your standalone g2, does it redirect to the upgrader too?
please post a link to your g2 / and to your xaraya.