Document databases are not new kids on the block. Lotus Notes did this in the early 90’s and Notes’ lead designer was instrumental in the design of CouchDb, Mongo’s main competitor. After maintaining a system for a few years which was developed in Notes I came to realize that there is actual value in the discipline and structure that a schema imposes on you. The problem is that in the absence of a formal schema, the “schema” is an emergent property which is reflected in the code used to manipulate the database, and with years of cruft and customer requests and changes it becomes a difficult mess. There is no clear specification of what is stores where, it is all a bit wishy washy. This leads to a big unmaintainable mess, link rot and a maintenance nightmare.
Well, I am not sure of the specifics of your system. But, you should be sure you have a compatible operating system (of course), and a 32-bit OS/chip if necessary, as well as enough RAM (over of course). Other then that, MediaMonkeey only skips ovr tracks if it is unable to read the tracks or if they are not in the proper location. You should also make sure your tracks are in the proper, playable format (mp3, wav, flac, etc) and that you have set proper permissions to each application, etc. There could always be a problem with the registry, in which case, the only fix is usually to re-install the operating system.