Giovaneveterano, good news I think..!
I just tried out my theory regarding the DB_IDEALTRACKSTIMES.BML and your Physics Fine Tuning mod is now working for me again. I can race Grand Prix and single races etc. and all the tracks load and play as they should do..
All I did was take Milestone's latest DB_IDEALTRACKSTIMES.BML file and copied it into the DB folder of your mod. So in other words I replaced your own modded DB_IDEALTRACKSTIMES.BML file with Milestone latest version. It worked first time for me.. No hitches at all.
I am therefore hoping that to make your mod perfect again perhaps all that you need to do is to update your own version of the DB_IDEALTRACKSTIMES.BML file. ?
I really do hope this helps to solve things for you as I know you have put a huge amount of work into it and it's a truly impressive mod.
Tracey