Problems with NextGen Gallery plugin

Hi,

I have installed the NextGen Gallery plugin on a website:

http://www.cabinas-tropicales.com (using the Colorway pro theme).

It worked fine until I added another gallery and tried to add more photos to it. I’ve only uploaded 16 photos in total in 4 different galleries, and once I tried to upload more photos into a 5th gallery, it just won’t work! The photos load and load and then in the end it always says “0” photos uploaded in the gallery.

Really don’t know what to do about it. Thinking of using a different gallery plugin cause I’m so frustrated with that one!

Any input would be appreciated!

Janina