i HAVE had this happen - seems all related to the neck thing. my neck itself never hurts but it sure controls everything else in my body. please see my post december 27th by glttrgal. maybe it may...
i just did a search for 'can muscles make a cracking sound?' and ended up here! in 2003 i ruptured 2 vertebrae -c-5 and c-6 (base of skull and below) - same area others on this site are indicating...