I presume this is a browser/cache issue rather than a xenforo bug. e.g: go to new posts restore dismissed notices. dismiss the notice (NB: I have only tried with floating) click on a post click on browser back button I am finding with Firefox & Chrome, sometimes the dismissed notice comes back (but will go if you refresh the browser. It doesn't seem to happen with safari, but I have had users complain it happens with IE. I have noticed it on this forum as well as my own - but is not 100% reproducible all the time. Can anyone shed any light on with this please?