Can't update any wpmudev plugins, including the dashboard

Other than manually ftping files, I haven't been able to use any of the update features for the plugins I have from WPMU. I have 4 plus the dashboard sitting waiting to be updated from January. When I try to update these in wordpress through the WPMU dashboard, it says 'Update failed. Maybe wrong folder permissions.'. I have checked and all permissions are still 755. I have no problems updating plugins of themes from other developers