After HF20 on 25th September, it became impossible for many to post comment, write blog, claim rewards etc. because of fault in their software. Now everything is normal. So, the blue banner above steemit is just informing us that everything is normal now. You don't need to worry. For more information, you can see my blogs.
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Ohh I see!! thank you so much for the info :) :)
You're welcome!