Been testing out 6 in a sandbox for a month or so now. Just noticed on an update to 6.0.5194 that clicking the Mura logo on the front-end editor bar doesn't hide it anymore. Tested on Win7 with FF 17 and Chrome 23.
Not a huge issue, but and obvious one for content editors.
Do you see any errors in your browser console?
Ah, that would have been good to include... Getting an uncaught referenceerror: createCookie is not defined on click
Fixing createCookie issue #664
Please update your site files and retest.
Matt, that did it. Thanks!