Thank you for the Log Files.
Ok, I can see where this goes wrong, and this looks like a very low chance coincidence. It is something like
If the file exists
copy the file
Despite the If the file still isn't there. Theoretically this can happen, because in the mean time a parallel process can have deleted it. This is a matter of a few clock cycles though, and if you can repeat it, it hardly can be this coincidence (unless it's always about the same album ! -> IS IT ?).
So again the question : Do you recognize that this happens since your new PC ?
And can you still repeat it when you higher the Player Priority ?
... but actually this can't be ...