I am regularly seeing the top edge of another Chrome browser window in the bottom right of my Macbook Air screen (OS 10.11.6). I can't see enough of the window to view the contents, but it only last about 2 seconds, and then whooshes off the screen. It often happens when I open a new tab or window while using Chrome.
Has anyone else experienced this? I don't have a screen shot because it happens so quickly.