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I would like to solve this problem (for future uses as your games are gone for good, unless you recreate the whole list [I'm sorry for that]).

1. Were you saving a gogimx that was already created, or was it a brand new gogmix that you just made?

2. Were the games removed just after you saved the gogmix or did you managed to save, view the list and it was gone some time after that?

Right now there's no maximum limit of games that can be added to gogmix.
The devs are OOO until Monday, but I've passed this along to them.