WiFi turning off when Ethernet connected, and not coming back on

Since about last Tuesday (possibly when I updated to Safari 7.0.6), whenever I connect my MacBook Air (2011) to ethernet, my WiFi turns off. When I disconnect the ethernet, the WiFi does not turn back on, which makes this an annoying problem. If I try to manually turn it on while Ethernet is still connected, it does the scanning animation a few times, and then turns back off. Without the ethernet, once WiFi is turned back on, it works just fine.  I'm using both the Apple USB to Ethernet adapter and a StarTech Thunderbolt hub with Gigabit ethernet, and this happens with both.  Everything is up to date, and the only change that coincided with this new behavior is Safari, but I don't remember if I updated it before of after the problem appeared, and I may not have noticed the problem for a few days as I don't often use my mac away from a wired connection.
Is this a known problem? Any known solution? When I search for it, all I find are people looking for ways to make the WiFi automatically toggle opposite the Ethernet, no one complaining that it's happening on its own.

Why are you turning cellular data off when you get home? If you have wifi at home, it will connect to the phone. Then, once you leave home and get out of range of the wifi, cellular data should connect automatically, you wouldn't need to turn it back on. Turning wifi off is really not necessary unless you are using it as a battery saving feature. I leave my wifi turned on all the time, as well as cellular data, and my battery lasts for quite a long time.

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