[Plugin: NextGEN Gallery] Background colour is Black and not transparent

Hi,
My gallery contains .png images – with transparent backgrounds.

Problem is, my NextGen gallery is displaying them all with Black Backgrounds

?

I’ve searched all over the forums here and the net for the last 3 hours … but with no luck. I can see though, that some other people have had a similar question – but no answers have been found yet.

Here is a link to the problem: https://kangaserver.com/weather/

Could the developer of this plugin please help?

Thanks
Jay.

https://www.ads-software.com/extend/plugins/nextgen-gallery/