I use it now for image galleries in articles, as replacement for Phoca Gallery. It is easier to use; you just need folders with the images, nothing else. There are no additional categories needed, etc. The only thing I note is that filenames such as “blabla (25).JPG” are not allowed.
Thank you very much for your review!
It depends on the selected JS view. For example, the Shadowbox can not handle images with extensions in upper case (e.g. x.JPG or y.PNG). You should always use lower case for the image names!
I solved the problem by selecting temporarily another template and then return to ja_purity. Then the problem was solved. Maybe it's a Joomla bug.