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Every think works now. The problem was, that I have the import from jQuery (v.3.3.1) in my program. With the NexGEN Plugin have the jQuery (v.1.12.4).
I have two different version. I deleted my include from jQuery and now it works find. Thanks

I just testet it with the twenty sixteen theme. Here I haven’t any problem. Sorry on this case it musst be a problem on my code.
Thanks very much and sorry about the trouble.

I have change the code. But it’s the same.
It think it’s a problem with the jquery.fancybox-1.3.4
I work on my local mashine.
Here is the 3 errors and 2 warnings that I see, when I look it on the chrome browser.

Uncaught TypeError: Cannot read property ‘msie’ of undefined
at jquery.fancybox-1.3.4.pack.js:18
at jquery.fancybox-1.3.4.pack.js:46
jquery.min.js:2 jQuery.Deferred exception: $(…).unload is not a function TypeError: $(…).unload is not a function
at HTMLDocument.<anonymous> (https://localhost:8888/moviment/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/ajax/static/ajax.min.js:51:11)
at l (https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:29375)
at c (https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:29677) undefined
w.Deferred.exceptionHook @ jquery.min.js:2
jquery.min.js:2 jQuery.Deferred exception: e.fancybox is not a function TypeError: e.fancybox is not a function
at e (https://localhost:8888/moviment/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/lightbox/static/fancybox/nextgen_fancybox_init.min.js:1:100)
at HTMLDocument.<anonymous> (https://localhost:8888/moviment/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/lightbox/static/fancybox/nextgen_fancybox_init.min.js:1:228)
at l (https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:29375)
at c (https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:29677) undefined
w.Deferred.exceptionHook @ jquery.min.js:2
jquery.min.js:2 Uncaught TypeError: $(…).unload is not a function
at HTMLDocument.<anonymous> (ajax.min.js:51)
at l (jquery.min.js:2)
at c (jquery.min.js:2)
jquery.min.js:2 Uncaught TypeError: e.fancybox is not a function
at e (nextgen_fancybox_init.min.js:1)
at HTMLDocument.<anonymous> (nextgen_fancybox_init.min.js:1)
at l (jquery.min.js:2)
at c (jquery.min.js:2)

I habe the same problem.
The jquery.fancybox-1.3.4.css and jquery.fancybox-1.3.4.pack.js are old.
I have a lot of warings and false.
I was traying so much thins.
Now I have installed the Photo Gallery plugin.

Uncaught TypeError: Cannot read property ‘msie’ of undefined
at jquery.fancybox-1.3.4.pack.js:18
at jquery.fancybox-1.3.4.pack.js:46
jquery.min.js:2 jQuery.Deferred exception: $(…).unload is not a function TypeError: $(…).unload is not a function
at HTMLDocument.<anonymous> (https://localhost:8888/moviment/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/ajax/static/ajax.min.js:51:11)
at l (https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:29375)
at c (https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:29677) undefined
w.Deferred.exceptionHook @ jquery.min.js:2
jquery.dotdotdot-1.5.7-packed.js:15 dotdotdot: No element found for “undefined”.
jquery.min.js:2 jQuery.Deferred exception: e.fancybox is not a function TypeError: e.fancybox is not a function
at e (https://localhost:8888/moviment/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/lightbox/static/fancybox/nextgen_fancybox_init.min.js:1:100)
at HTMLDocument.<anonymous> (https://localhost:8888/moviment/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/lightbox/static/fancybox/nextgen_fancybox_init.min.js:1:228)
at l (https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:29375)
at c (https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js:2:29677) undefined
w.Deferred.exceptionHook @ jquery.min.js:2
jquery.min.js:2 Uncaught TypeError: $(…).unload is not a function
at HTMLDocument.<anonymous> (ajax.min.js:51)
at l (jquery.min.js:2)
at c (jquery.min.js:2)
jquery.min.js:2 Uncaught TypeError: e.fancybox is not a function
at e (nextgen_fancybox_init.min.js:1)
at HTMLDocument.<anonymous> (nextgen_fancybox_init.min.js:1)
at l (jquery.min.js:2)
at c (jquery.min.js:2)