USGS Imagery is back, so are hidden aerials, plus dark colors and a couple of fixes.
Thanks to anyone who tests this out and/or provides feedback/bugs!
http://topofusion.com/beta.php5.48 10/30/2017
Restored access to USGS Imagery due to server change - expanded coverage?
Added support for Dark colors in gpxx:displaycolor - read/write
Fixed hang/crash in goto coordinate
Updated hidden sat tiles
Fixed hang in loading many photos at one time (looped linked list)