Hello!

I'm there to say that my project just broke ;-;

I was creating an music creator just like Chrome Music Lab's Song Maker but when i opened it again most sprites had an ? Square instead of the original costume. It took 4 DAYS to make, so i was very sad. Because i had to make everything again, i used clones because if this bug happens again, i won't have to change every single sprite's costume.

This is just because a costume failed to load. If a gray question mark appears and you never edit it in the costume editor, the original will still try to be saved and reloaded when reloading the project (so your costumes probably aren't lost).