Gallery could not load

Hi,

first off all, I think it’s a great plugin and I love it.

My problem:
I insert the slideshow pro in a tab (Plugin Tabtastic for DMS 2). Sometimes it will be show correctly immediatly at the first time of opening the tab, but mostly I only get the message “Gallery could not load”. One or two times refresh of the page helps and the gallery will displayed. I mean only the slidesow pro (comment and lightbox are disabled).

What could I do to solve the problem?

Regards,
Hartwig

https://wordpress.org/plugins/nextgen-gallery/