So, every single one of my assets just disappeared - kind of. The items are still in the asset bars, and show in the layers for each level, but all of the artwork is gone, both from the asset bar and from every single level of the game. Luckily I save a lot, but I had just finished a rather time-consuming task that I really don't want to do again, and it didn't get saved. Any idea how this might happen, so I can avoid whatever does it? Has this happened to anyone else?
I had the same issue a couple of times. Selecting a different frame in my object animation menu usually fixes it for me.