I opened photos on our desktop yesterday and it is empty. (?!?) Do I need to schedule a (remote, obviously) session with you or can you direct me to fix instructions somewhere? I have tried "repairing" with option-command but no luck.
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You may have accidentally pointed the Photos app to the wrong (empty) library. New empty libraries can be accidentally created by Photos when it doesn't find the original library. Try holding down the Option key when starting Photos and you will get a box listing all the libraries that are candidates to be open. Hopefully you'll see the original library. Once you've pointed it to the good (larger) library, it will remember your choice in the future. The library label "system" is the one you should be using as it is the only one that will sync to iCloud. Let me know if this doesn't solve it for you.