Rune Dragons first phase still bugged ever since M&S update and no word of slayer cape's bugged 4% proc chance on max/comp/support capes.
I only just answered to your post about the slayer cape bug 5 days ago, FYI i just checked the fix and it's working fine but fixes can vary in the time they take between being reported and being patched for all kinds of reasons.
RE: Rune Dragons i'm looking at the job i made for it a while ago and can see it was already fixed and patched. If you're still seeing issues can you report another bug detailing what weapons/ammunition you're using?