It is hard to tell without more information... I would restart again and watch the log files closely on startup taking note of any errors etc.
Then please include environment details and maybe a screenshot of what you are not seeing.
To be honest, if I were guessing without much informaiton, I would think that maybe you lost permissions somewhere. I can't see how you could just lose the workflow, but maybe lose the permissions to see the project or workflow make more sense.
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