Do you really think people that are NOT experiencing the problem - ARE reading about the problem 
1200 VIEWS of the problem... those are unique, not repeat views.
I've viewed this thread, but don't have the problem, does that make it 1199 people?
Oh hang, on I saw someone else in this thread say they've never experienced it either, 1198...
...do you see the flaw in your logic yet?
People view threads here out of interest, or to see if they can help, unique thread views do not equate to the number of people who have that problem.
So, let's look at MusicBee itself. MusicBee is developed by ONE person and it's totally free. That ONE person puts a huge amount of effort into improving it constantly, answering questions, acting swiftly on people's reports and adding requested features.
I've been using MusicBee for three years now, and in that time Stephen has looked into and fixed minor errors I was having, added one or two things to the app that I requested and been helpful and courteous in every dealing I've had with him.
Try and get that level of service from ANY paid software. In this case, he's looked at the problem, can't reproduce it and therefore can't spend any more time on it, perfectly reasonable. What do you want him to do, spend ALL his time on a problem he can't reproduce?
Now, as to this problem, I've never experienced it with MusicBee either, but I DID experience it, and many other problems with files being moved or deleted, tags being altered no matter how many times I turned that setting off etc etc etc when I was using Windows Media Player (WMP). Unless you deactivate it WMP works in the background ALL the time moving everything to where Microsoft programmers want it, rather than where you want it. My advice would be to look in WMP settings and make sure that the folder it uses for it's library is one where you don't actually store any of your music files. That alone may solve the problem.