Just to let you know, I experienced some problems with downloading images from the gallery. I had placed my galleries in the fotos folder that I had created in the joomla root. Displaying the photos went fine, but downloading did not work (404 error).

When inspecting the download.php I found the following code:
...
// Reference the "/images" or "/media/k2/galleries" directory
$ref_com_content = $siteUrl.'/'.substr(str_replace(DS,'/',$pathToSourceFile),0,strlen('images/'));
$check_com_content = $siteUrl."/images/";
...

I then decided to move the fotos folder to the images folder and changed the root folder for image galleries to images/fotos and everything worked fine.

Please fix this or mention in documentation.

regards
Paul