This has been a recurring problem since before version 8. At some point in a sketch the Entity Info window will move to 0,0 on the screen OR whatever the coordinates are for the lower left corner of the screen.
It doesn’t seem to be sketch specific, because loading a different sketch does not bring it back on screen.
I know it is in the upper left, because sometimes the keyboard shortcut will show the bottom of the window. I can then adjust the sizing of the window, but can never move the window.
The only way I’ve been able to get it back is to shut down Sketchup, but that doesn’t stop the behavior.
iMAC 24-inch, Early 2009
Processor 2.66 GHz Intel Core 2 Duo
Memory 8 GB 1067 MHz DDR3
Graphics NVIDIA GeForce 9400 256 MB
Software OS X 10.9.4 (13E28)