In the TG4 Preferences I set a path for these three file types :
==> TG4_FileSaving.jpg
Then, as you wrote, on the Renderer tab I do the same for the Sequence/Output paths.
I saved the settings in a default.tgd which loads automatically everytime I start TG.
So, when I save a TG session under a new name those paths are always set.
That means, when I open a scene file, any previous scene file the files alwayss get saved there.
I really cannot remember TG`s default behaviour anymore, since this has been my setup for as long as I remember.
Any update uses the Preferences of the previous installation. So, the paths get carried over to the next installation.
Is that what your asking?
CHeers, Klaus