Hi!
Unfortunately there is no way to turn off the social metrics in OSE reports. You should still be able to navigate around the page and export the data via csv while these metrics are loading. Clearing your cookies/cache and restarting the browser may help if you're having problems navigating the site while these are loading. Another thing to try is accessing the site through another machine to see if this issue is specific to yours. If none of these work, send a ticket into help[at]seomoz.org and we'll take a deeper look at this for you. Thanks!
Sam
Moz Helpster