The only person who can merge is the PM (or anyone on the truste list) of the green privacy profile. That is because of the new merge process; you need editing rights to complete the merge.
Chris W. said that there is a change for this, so that Green privacy profiles in a default-approved merge will automatically be set to Open. It probably does not work for merges that went to default before this new change was made. So the problem should disappear in time, but for merges which are currently stuck before this you need to contact the PM and then the Team if there is no response.