Thank you both for your replies, i have installed the Pongo 28-05-2017 and its working okay.
I will download the new version again and make a fresh install, I will let you know how it turns out.
It looks like there was something wrong with my first install.
Tested today with the new skin and works fine now.
My best guess is i have a ram memory problem when all skin functions are activated, I turned off the ones i don't really need and everything's works okay.
Thx grtz Ludo.
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