Edit2: Somehow it works again now
My Gold membership ran out, but after i purchased and activated the new one on 13th Dec. , Destiny does not recognize it so that strikes/crucible are locked.
Regarding the Gold membership everything else seems to work e.g. download Games with Gold.
I have also tried obvious things like turning the console/router on/off or switching profiles.
Edit: Also unplugged the console for half an hour and it's still not working;
It's not a trial-membership(3 Months)