Help! I completely lost my dashboard
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Typically the latest version will be approved. Check the box for a previous version and click the thumbs up to approve it. Then navigate to your home page and see if the issue persists. Roll back a few versions if you need to but dont actually delete ANY of them until you figure out if this is the issue or not!!
EDIT: Once you roll back and find a version that works it's safe to go back to "versions" and delete all the newer ones from your approved version.
Hopefully this helps !!
You can easily find out if it is a block that is causing this by switching page type (hover Edit > click Design > change page type). If the problem goes away after switching page type, then you need to find the culprit in the page type and remove/fix it.
If it is a block that is causing this you can try to find out which one by deleting them one by one and reload the page after each publish (or preview). Don't worry about losing any information since the previous versions still exist. Once you have found the faulting block you can roll back to the version holding all blocks and just remove the faulty one.
In my experience, you often have a slider on the home page, and most sliders you find on the Internet comes with instructions to include jQuery - but that is not needed with c5, since the core adds it by default.