Hey… Has wick gone crazy for you? There is no timeline, but a black box in the corner. 
wHY aGaIn???
IT HAPPENED TO ME TOO! it was really slow for me and i had the same EXACT screen as that picture
fixed for me 
Hey everyone,
If this happens to you, try performing a “Hard Refresh”. You can do this by holding down…
CTRL + SHIFT + R (Windows)
CMD + SHIFT + R (Mac)
Hopefully this will fix it!
Yeah, this hasn’t happend to me, so I think you just have to as Luxapodular said preform a “Hard Refresh”.
Because my wick is fine for me.
Hope your wick editor gets better so you can start animating again.
it works. probably the pc was messed up