Slider working after refresh

Slider working after refresh

Hello,
i have a slider at www.viviautismo.org (the one with logos below the 4 grey boxes) that only works after a F5.
If i press CTRL+F5 the slider stops. The website is made with Wordpress.

I thought it could be a jquery problem but all i could do was to reduce the jquery calls to the only one in the wp-include folder.

i asked to the author of the plugin but he doesn't answer no more. I suppose he doesn't know how to solve.

Any of you can give me a helping hand?

Let me know if you need further info.

Thanks,