For an April Fool's project at work, I hacked together circle avatar by having a border-radius set to the width and height. Thing ones, when the panel they were on grew enough to need scrolling on Chrome on my laptop, the boder-radius would be ignored! But NOT on the same version # of Chrome on a coworkers laptop.
Weird. Stackoverflow to the rescue as usual; putting a opacity:0.999; or a perspective:1px; made my system behave.