When I installed Screen Protractor and launched, it appeared to be working OK until I launched Google Earth version 6.0.  The screen protractor disappeared and when I Click on a function in Google Earth, I see Protractor for only that time.  Then when I click on a location, the protractor disappears. 

ANy help on this?

Thanks,

The Screen Protractor and Calipers will work with any application, although applications that use motion graphics do occasionally cause some flicker.

With Google Earth you can change the graphics options to stop the flicker. Go to the 'Tools' menu and select 'Options...' then under 'Graphics Mode' select 'DirectX' instead of 'OpenGL'.

This should solve your problems.