When I compose a post and insert an emoticon, that emoticon promptly disappears if I do anything else in the post — continue typing, apply format changes (like the type of font, etc), cut and paste, or whatever. The emoticon only stays if I insert as the very last thing I do before hitting the button to send the post. I've tried it on Chrome, Firefox, and Safari browsers and it acts exactly the same way on each, so it does not appear to be browser dependent. I also did the usual stuff like clearing cache, restarting my computer, etc. This is the only site I have that problem with, so I wouldn't think it an OS related bug. I do run a Mac though, so it may be that the site's coding somehow does not play nice with Mac browsers.