The problem is that Cloudmin doesn’t see any KVM instances and even doesn’t see itself, as a host; So i cannot create new VMs or manage those already created, though the VMs are running and i can access the “edit” page of one of them via “Favorites”.
What happened :
I was in the process of creating a new KVM instance but it stuck at “expanding disk” so after waiting an unusually long time i left(redirected) the page to “List Managed Systems” and…it was empty. Also, Cloudmin Settings were reseted, like all the fields and radio-buttons were empty/unchecked. I tried to set everything back and rebooted the Cloudmin server, nothing helped.