keep trying, this happens to everyone initially.
you say you changed materials and closed the editors. but did you save persistence. ? re do your work, look at persistence file if RTB made one (did RTB make one?) then save it. the study it again man !
if RTB didn't save you one. then goto top bar, select venue. and choose "export to AC".... try this. I personally don't use this, but that's a whole other story.
I didn't use RTB. These are conversions so I use 3DSimEd3 and the ks Editor. Here is what I did:
1) In ks Editor I changed the Ambient and Specular numbers for all materials. I did it in here because you can't see the changes being made in 3DSimEd3.
2) When finished, I saved the KN5 file.
3) I loaded the KN5 file into 3DSimEd3 to make a few changes to the track like adding a few more pit and start locations.
4) When finished I verified that my material changes were still there and then I saved the FBX file AND the persistence (INI) file from 3DSimEd3.
5) I closed both editors and I ate supper :-D
6) I return and load the FBX file (and the ini file?) into the ks Editor and see that my material changes are not there. I check the persistence file and the material changes are shown in the file.
ks Editor just doesn't seem to be loading the persistence file. As I said in the message above, I even forced a manual load of the persistence file in the ks editor but nothing seems to happen?