andasp, you have the jams in the wrong folders/locations then, there should be no reason why any of the tracks and jams don't work unless you haven't copied them to your directory properly.
I have said many times Monaco won't reduced properly (nor will Hungary 03-10) so to get it workable in GP3 1.13 i had to remove EVERYTHING all objects and jams, so it looks @#$%&. I have mentioned this before. So I haven't done anything wrong monaco just looks awful reduced.
All other tracks should be perfectly okay.