I had it twice till now... but can't reproduce the error.
After working in other non-MM-programs, I come back to MM and then the player is gone (after CTRL-ALT-L you can normally put it back) and the chinese characters are there...

I can send you a screenshot if you want

Just tried it but everything looks okay...?

Dutch language package:
In menu 'extra' -> 'analyse volume of the selection'
and in 'beeld' -> ''Start/Stop Visualization'

the characters are corrupted by some eastern/chinese characters

Ah it appeared when the mediaplayer on the bottom of the screen disappeared. When I made the mediaplayer visable again, the chinese characters disappeared