Update: It doesn't work on Windows either. It worked once and I guess it was a fluke.
Also, I've used two different ethernet cables.
This is probably the most confusing computer issue I've ever had. I am on a new iMac, and the wireless connection is very fast and almost flawless. I decided to try wired just to optimize speed, but it's worse. The speed test is great, but strange things happen. For example:
When doing a Google image search, some images load and some are blank. Every once in a while, my browser won't connect to a site. It seems to time out and I have to click refresh.
What's even stranger is that this only happens when using OSX, but not when using Windows (I use Boot Camp).
I'm completely stumped. What's going on?