Before the Community update I could insert WL code. Now the button for code is gone. I feel lost.
Hi Gianluca,
Do you mean pasting code like this?
Plot[{Sin[x], Sin[2 x], Sin[3 x]}, {x, 0, 2 Pi},
PlotLegends -> "Expressions"]
You first click on this button:
then you will get an empty field to write or paste your code inside it
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I will try it now:
u''[x]
What did I do to get
I can’t remember.
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Glad to see it working now 
The distorted formatting happens when you write the Wolfram code in Markdown outside a code field.
To avoid this please make sure you start a code field first, then start writing or pasting your code inside it.
I hope this helps.