Since this morning my website is working property but i try to move the cb login from "position 7" to a different position. From then i lost the connection with cb login, when i try to login i take a white screen always with some symbols than i can't understand. From kunena i can login but i can't view my profile. In my side bar i have a user list from k2 and from there i can see my profile.
What happend?

This is my webpage www.wargamer.gr

My web page is build with joomla3.3, k2 (dev edition), alphauserpoints, kunena and last edition of community builder.

p.s.when i activate the debug option from joomla, it's saw me a some errors from udpui_extensions what is this extension .. it is from community builder?

.. My cb register module is working property.

I've done all the test from cb tools and all results is green

With the debug errors you mention I'd suggest checking your Joomla and CB plugins. udpui does not sound familiar... if you find a plugin with that name disable it and try again.
Try disabling third party plugins one by one to find which one might cause the error.

PS: if your template is causing a conflict, switch to the default template temporarily to see if the problem persists.

I install one plugin this morning and now i have this inactive now

I think that the problem is that i moved the cb login from the right location