Object Animations Not Showing

Everything was showing just fine. Then I opened the engine after a few days and ran a preview and now the animations for half my objects simply don’t show. They’re there, the resources are good, but I just get a red X in place of the animation. Any help is appreciated.

Can you give more details about your issue?
You’re talking about an issue at preview but attached a screenshot of the scene editor.
What do you see in the resource manager?

I don’t know if it’s the same, but I had a problem with version 5.3.199. One of the animations of 3 different objects did not work (they did not show an image), no matter what I did, when they had always worked fine. This happened from one preview to another. I renamed the files again and loaded the images in the animations, but nothing. The events did not have any issues that affected just those animations. There was no way to solve it. I simply closed the program without saving changes, and when I reopened it, it worked normally.