I am having the same problem.
I think this problem started with Rekordbox v2.0 . There were no problems before.
Also, it seems that this has nothing to do with track previously analyzed with the 1.x.x version, cause it's happening with newly imported tracks too.
I also can't find any information on the web, except now this forum topic.
I wanted to re-install 1.6.2 but can't find the setup files anymore, so a solution for this problem would be highly appreciated.