kindlefix only works on MOBIs from OverDrive (not from mobipocket.com), which typically means lending library MOBIs or some from Books on Board (they tell you if it is from Overdrive or Mobipocket). You then need to add the Kindle's PID your list at the provider's site, download the ebook, and then run kindlefix with the Kindle PID. The reason that mobipocket MOBIs don't work, is that they won't let you add the Kindle PID to your list of PIDs.
In contrast, mobidedrm works with any MOBI ebook and with any PID in that ebook. That is because it is circumventing the DRM, kindlefix just allows the DRM to work on the Kindle (hence you need the Kindle PID inside the MOBI).
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