problems with account creation

Page transitions can not work without ajax loader.
If you use ajax loader you can not use any component that uses ajax calls because they will collide and any component that uses hashed URLs (have # in url.)

Ivan I understand what you say but I write again that everything was working before.
Anyway.
Now I disabled disqus. Ajax is enabled, transitions and infinite scroller enabled too.
Infinite scroller don't work with the new k2 category
alisverisi.eu/index.php/blogs/to-imerologio-enos-trader
Can you help me with this? Is there something I should know about how to create a new category (I mean the settings) so that infinite scroller work?

I debug it a bit . It looks it does not detect scroll event. That is usually caused by some other script thing taking that event handling completely.

Other thing I can imagine are Greek letters :

load text : "περιμένετε... έχουμε κι άλλα άρθρα"
finished text : "επιτέλους... τέλος"

First if you added something or activated recently disable it. Second see what happens if you use alphabet letters for those two phrases.

Thanks that you try to find a solution.
I don't think there is a problem with greek letters or something installed because the scroll works in the old categories (you had with the template)
See the category below and notice that greek letters display fine.
alisverisi.eu/index.php/cars-bikes-and-transport
the same is happenning when you see
alisverisi.eu/index.php/cinema-music-and-arts
etc
Something is wrong with this new category i created.
I did another new category for testing and had the same problem.
If I make a menu displaying all k2 categories including the new Το ημερολόγιο ενός trader scroll don't work if I remove the works.

Try removing leading and intro items -setting them to 0 in menu item settings

Not working.
The category menu (the new and yours old) are exactly the same. They use parental settings from k2 categories.
K2 categories mine and yours are the same. I tried to give mine parental setting from an old one that works.
No result.
Another strange thing is that. K2 categories mine "trader" and yours "cars" for example are the same, they have 0 leading, 4 featured and 4 secondary articles. Both categories have more than 15 articles. Cars displays the 7 first articles and the scroller works and brings 2 by 2 or 3 articles. Mine "trader" stops at the first 7 articles like there are not more articles. I don't know. It seems pointless to try.
And after all I can't use disqus for comments because I wanted the effects and the scroller.