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If the computer crashed before you saved, then the document is gone forever. That's why we save regularly. In fact we even save large projects to different file names, because if your system freezes part way through a save, then that document will almost certainly be ruined, for ever.
If Photoshop seems to be messed up, then reset Preferences. If that does not fix it, then reinstall it, but run the cleaner tool after the initial uninstall.
Thank you Trevor- I did save the file, which is why I still have it in my folder and was able to try re-opening it. I had saved it twice once it was seeming laggy, so it was definitely saved before everything froze and I had to restart. It's saying it is not a valid document, but it is allowing me to open the other document I have that I was working on a day earlier.
I will attempt resetting my preferences and reinstalling if it doesn't work. Hopefully that will put it back to normal.
If anyone knows why the layout of Photoshop suddenly changed after it crashed, I'd still be curious to know, so that I can avoid it happening again in the future. Thank you.
It worked! Thank you very much! It looks like when it crashed it just changed my preferences or reset them or something.