Your XAMPP is configured to run PHP 5.3 in strict standards mode. CB is strict standards compliant, but Joomla is not. You need to configure PHP.ini to NOT display strict standards warnings. Please navigate to the below.

xampp/php/php.ini

Once there find and change the below.

error_reporting = E_ALL & ~E_STRICT

This will hide strict standards errors. The default settings in XAMPP is to display everything.

j_stark wrote: I could really use some advise.. Can´t seem to find a solution!!

For future reference please be patient. You posted only 2 hours ago, we've over 300,000 users registered here and several of them being subscribers with a good amount of them posting support questions. We'll answer posts generally within 1 business day, but usually within a couple of hours excluding weekends when I am not here, thank you for your understanding.

Actually i found a simple way to the solution.. Go to Site - global configuration- server - and set error reporting to simple (does not work if set to NONE)??

Don't recommend this. When using localhost to test and build your site you want to see errors so you can see if there's a problem. A lot of people have the bad habit of suppressing errors, but that doesn't mean the errors go away.. you just can't see them.

At any rate glad your issue could be solved!