I down loaded Gimp 2 and set it up as a preference in the external editor in light room 5 but when I try to transport a photo to gimp the screen opens and wants to load the whole gimp program over again. Gimp is already loaded because it will open in the desktop location.
i have tried several times , even allowed it to re install gimp but still will not open from light room.
Just a thought-
Check you have the external editor preferences pointing exactly to the Gimp program file.
If you have selected an alias or shortcut or a pre-loader, then you may see the problem you are having.
This is often a problem for people with Photoshop Elements for which the preferences have to point directly to the Elements "Editor" (and not Photoshop Elements.exe)
I have not used Gimp for a long time! Some programs have an option to only allow one instance of the program to open- check all the preference options in Gimp itself.