Problem: You try to log in using correct Nearmap credentials in Google Earth, but the login window keeps re-appearing, even if you click Cancel.
This can happen if Step 3 of our Google Earth integration instructions was missed. If Google Earth saves your validated credentials to disk, it will try to use the same saved Nearmap authentication cookie every time you try to log in. That may be fine if you haven't logged in elsewhere. However, if you've used the MapBrowser more recently, the original cookie becomes invalid but Google Earth tries to use it anyway.
Solution: Clear cookies in Google Earth, and prevent Google Earth from storing cookies in the future.
Locate Google Earth's cookies on your hard drive. On Windows machines, Google Earth cookies are usually stored here:
Delete this file.
Repeat all the steps of the Google Earth integration instructions.