Variables and Constants suddenly disappeared
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This is the second time this has happened to me. The variables and constants somehow suddenly erased. What causes this to happen? Any way to you restore via the server?
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Phew!!! figured it out. All I did for the bug was turn off a block. To solve, I did an undo via the history. Wish I'd know this before.
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Congrats for finding the solution!

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I feel this has something to do with having the project opened in more than one tab. This usually leads to such unexpected and catastrophic consequences for the project. Not the fact that the same project is opened multiple times, but when you start doing something on an older instance of the project, there would be discrepancies with the newer version that is in the database on the server.
At the moment there is no functionality to auto-detect when the same project is opened 2 or more times at the same time, so personal attention is required.
Don't work on the same project in 2 or more different tabs. It will be possible to work on different projects this way, but not on a single one. If you have one project opened in one tab, close the other tabs where it is also opened. Also, if you have a tab opened at a certain project hours ago, reload the page just to be sure.