NextGen Widget Problems

A couple of days ago I included NextGen Widget onto the right & left side bar of my theme (Parabola), it was working great, I set one side to display recent images from my galleries, the other random).

This was the first time I had ever added any widgets at all to my WordPress site, so decided to experiment with a few other different widgets, but decided the NextGen looked best.

I deleted the others and returned to NextGen but have been having problems since. I have found that a couple of images show and, instead of others only their names appear, also one image keeps appearing that I have completely deleted from my gallery & website.

Wondering if it was simply a bug I have completely deleted all my galleries and uploaded them again, first importing them as 50% Jpeg, finding the same problem, deleting them again and uploading images as original size Jpeg.

I have also just tried to include a slideshow NextGen gallery to one of my pages which doesn’t appear to be displaying either.

Any help & advice would be appreciated

https://ww.wp.xz.cn/plugins/nextgen-gallery-sidebar-widget/