snecz on "[Plugin: WP Parallax Content Slider] Multiple shortcode-Sliders"

I use
<?php echo do_shortcode( '[parallaxcontentslider cat="8"]' ); ?>
in template
and also tried with
[parallaxcontentslider cat="8"]
on page content.
No errors, just can see yellow wawes but no slides.
Thanks for reply. I'm just about to finish new site and that's my last problem...