Recently, I have found that when I return to a finished project to revisit it, changes have happened. I'm not talking about missing footage, that can be avoided by collecting files at the end. It's bizarre things like key frame animations using shapes built in after affects that change. Animations that have been set up and rendered, no longer are set up in the same way. Why is this? Is it the Gremlins. Any help on this would be gratefully received, I would say that I would pull my hair out, but I have no hair left to pull out, so I just say it's frustrating.
Nobody can tell you anything without proper system info or other technical details liek exact version of AE, what stuff used, where your files are saved and so on. you know, you can tell us all about the blue sky, but we have nothing to work with and verify any of your info. Screenshots tell a lot as do details about your procedures. For all we know you just have a permissions problem so your actual files get never saved or some external influence is restoring files from a previous date. Aside from occasional cache corruption issues that can be solved by flushing the cache I would assume AE has no mind of its own that changes what you created...
Thanks Mylenium, that's given me food for thought. I'll do a better job next time of asking a question.