when it was raining the sky went flickering between darker en lighter, (Server)
PS: the console doesn't post any messages, About the console: http://gyazo.com/fcc93084fef8cdbf236c6ad6753567bf, just started it up, notting was sayed in console, even when i send something, most of the commands dont work either,
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Stop and then start the server again, that fixed it for me.. or at least it hasn't happen again yet.
But the problem with Server console not showing anything remains..

Redownload the server jar
Updated it, About the flickering sky, theres hardly no other stuff to say about it. it just flickers when its raining

And again: To fix the Server not outputting anything, redownload the server.jar.
Missed to say that redownloading the console isn't working
Yeah, re downloading server jar does not fix the problem..
Your blank console bug is already mentioned in a few reports. Duplicates: MC-32850
Simplifying this ticket to the most prominent of the multiple bugs posted here. It is much easier for us to deal with bug reports when they contain only one bug. Feel free to create new ticket(s) with additional bugs.
Please put only one bug report in each ticket. It is very difficult to keep track of bugs when they are not in their own tickets, and it is easier for you to make multiple tickets than for the mods to separate them.
Duplicate of MC-32850 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
Any screenshot or videos? And maybe a better description, because I have no real idea what you mean...