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No you aren't the only one to have this issue Angelica
It is probably a daft thing for me to say, but please make sure you haven't accidentally been signed out of your game.
The last time something like this happened there was a problem with King's servers. A lot more people complained that time though.
the users are still appearing, he did not leave the user is more to send the group invitation, practically the page is blank (thinking) if it is as you say that only some users are affected, they should see how to solve this inconvenience, if the game anda the levels are updated, but this part of awards, join a team or competition bombs or bags of candy, that update does not appear as if it was never there.