Deleting Posts

For some reason, when I click the 'more' drop-down menu on the posts list it's not letting me delete posts anymore?  I'm not wanting to flag it as offensive, I just want to delete a couple of posts for one reason or another.  I am also wanted to add a new member to my group.  When I click on members then invite it goes to an error screen.  It's done this over and over again all morning.  Any suggestions?