Okay, so my ambitions were apparently too much for the GOG Mix system. I created a list containing all games that come along with a downloadable soundtrack. I have to admit that before commiting this server rape I wasn't aware of the fact that this applies to more than 50% of all games on GOG. Anyhow, when saving the list I was already afraid that something might go wrong but it didn't. However when I edited it to add some descriptions it was too much for the mix. After saving all entries were gone.

Well, obviously it was too much for the database so I'm gonna do another mix, however this time only adding soundtracks that I already know and where I can add some nice descriptions. Still I'd like to know if anyone has ever encountered similar problems before I continue. I don't want to waste more time on this than I have to.