Hi. First, let me explain that you're not writing to Adobe here. This is a user to user forum, and sometimes, Adobe will come in and respond to some posts - but otherwise, it's users who are responding. Do you, by any chance have Edit>Preferences>General and have "Reset Preferences on Quit" checked? If so, that's exactly what it will do. If you don't have that checked (Normally, that WON'T reset your Actions), please submit this as a bug report in the tabs at the top of the Photoshop Ecosystem threads. IF your Photoshop ran an update without your permission, please ensure you go to your Creative Cloud app and in Preferences, DE-select Auto Update. Please note: Photoshop did not come out with an update, last night. Please do back up, regularly. And, then backup your whole system, regularly. If you create incremental backups, you can always find your settings, if any issues occur.
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