Gran Turismo 5 - Tracks won't load

I have Gran Turismo 5 backed up to my internal HDD.
Most tracks/races work but some of them, some of the time just wont load all the time. It starts to load, when it's loaded 75% (something) the HDD light stops flashing and the progress in game slowly goes to 100% and stays there.
Does anyone else have the same problem?

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@Remf which Firmware and which payload?

on 3.41 with hermes 4c you have to delete the gamedata (NOT SAVES) and run the game with multiman on Patchmode(r1). After the first Start with multiman you can use all the other BUM's bud only with selected PATCH ON!!!