Even if I add all files I have to the playlist Shuffle Tracks tends to favor some tracks over others. At least after stop has been pressed it starts playing a pattern of tracks (not always in the same order though) that seem to be favored. Have anyone else noticed the same thing?

Here we go again.

use search
and test another time, work as espected

Please search the forums for words like "true random" or "random vs shuffle" or anything else you like.
You'll be surprised of how many words (and even energies, from somebody) have been spent about this slippery subject.

Good luck.