Hi Adriano
I was in touch the with ThemePunch (Rev Slider developers) over the weekend and they identified and addressed the issue on the site I had problems with.
They plan to address the issue in the next plugin update but, in the meantime, I have asked them for details on what they did to address the issue and will share the details here when I get them (so I'm opting to keep this open for the time being).
Many thanks
Dawson