I have this problem. I have copied a space using a an Add On. I am unable to manage permissions on this space (or for that matter even see this space in Spaces main menu) even though I am an Admin.
Sometimes view permissions can make a space invisible, even from a site admin.
Go image2015-8-5 13:52:57.png --> General configuration --> Space Permissions (under USERS & SECURITY) and see if it is listed there, and adjust permissions accordingly.
There were times, however, that I had to have Atlassian support grant me access to spaces in Cloud. The problem hasn't happened since we moved to Server.
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