I have the exact same problem. It's most notable on medium darkness gray backgrounds. The chrome taskbar will always be visible, even after rebooting the computer. It doesn't look like a traditional burn in, as the ghost image will change over time to reflect for example the latest webpages I was looking at. I first noticed the problem a few weeks ago, but it seems to get worse now.
There is also some vertical bleeding of light and dark areas, for example, while dragging a white window on top of a dark background, you can see a faint (but still very noticeable) lighter area above the white screen going all the way to the top.
