My library just vanished!

While working on my laptop on Friday afternoon (1st April 16h25 French time), I had Zotero open and was showing a friend how I can link to PDF files using Zotero. I double clicked a couple of times on various PDF documents visible in Zotero and suddenly all my library vanished and all I had was a screen save of my institution's webmail which was also open.
Back at work today and hoping it was all just a bad dream!
No library.
What did I do?
Is it repairable?
Can I somehow get back my libry as it was prior to Friday 1st April?

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