tizz

@andrianiannalisa I tested now with another theme (Twenty-Fourteen by WordPress) and I confirm that the NextGEN image title on mouse-over is there by default.
I would say that maybe your theme prevents to display it or, more rarely, it could be a plugin. If you disable them all but NextGEN and activate a WordPress theme you’ll see if it’s the case.
The final solution is to create a custom template as @cais said, or ask to theme’s author if it’s a theme issue.

@ruslendingur If you have nothing to say please don’t waste free support volunteers’ time and attention.
If you have issues you can have huge help, otherwise your non-constructive criticism about a free plugin it’s no use to anyone.

@eldesignsauce You can also find some recent examples here

@ludovica.zanutto, are you using the WordPress default URLs or custom permalinks? Please, post a link to your site.

@ssergutaboselaw You may need to manually delete the three tables in the database of NextGEN, after backup.

Edit: I’m late…

1. How can I delete the “X Photos” bit under each of the compact album galleries?

@miealex and @cais, Pardon me if I jump in, but a simple CSS line in NextGEN custom area isn’t easier and safe?

.ngg-album-compact p {display:none;}

@solomuner Have you cleared cache/caches switching from one effect to the other?
If this does not work you can try also deactivating the current theme and activating a Twenty series default theme.
Also, a link to the page with the issue can help to see the source of the problem.

@solomuner What effect did you choose in Other options > Lightbox effects?