Hi!
I have installed and tested this new version 0.8.2.

MyPaint 0.8.2 crashes almost immediately if I launch it from desktop icon.

BUT like, adancau said:
... if I launch MyPaint using "sudo gainroot" it not apparently work.. example you can not save your work.. it even crash.

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if I launch "X Terminal" and type "mypaint" it works perfectly fine?!
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Overall this version feels amazing speedy!?

I made picture whose size was over 3000x2000px. and there is no
any problem to work with this size! Amazing! Brushes also responds and react very fast.. same is true about zooming and rotating canvas...

..and this is why, I think it could be that CPU running at full speed all the time?! At the end this is not maybe so good thing.
NOTE: This CPU thing is only my guess, nothing else and I hope that I am wrong.

Thanks anders_gud for great work and good luck!