inline-block rendering issue on a specific Mac
I have run into a really strange problem. I do web application development and I have an app that uses inline-block. On one particular Mac (a MacBook Pro Retina 15, OS X 10.10, but I saw it with 10.9, too) the elements using inline-block display incorrectly. There may be other styles that are wrong, but the one I have found is inline-block. The really weird thing is it is broken the same way in Safari, Chrome and Firefox. I'm at a loss to explain how the same problem could show up in browsers with different rendering engines. It's obviously something to do with this specific Mac. I'm guessing I install something that tweaked a system-wide setting. No idea how to start tracking it down.
Has anyone ever run across such a thing? Again, it's specific to one Mac but spans browser rendering engines.
MacBook Pro with Retina display, OS X Yosemite (10.10)