Hello,

I'm new here and was not able to see any similar problem in this forum.
I just installed Piwigo and added first pic. Now:

- If I click on picture thumb then an empty page appears from
http://photo.mysite/picture.php?/1/category/1 
and only <Back> can restore previous page.
However, <Zoom> works.

- Also the following pages become empty:
.../picture.php?/2/category/1&slideshow=
.../admin.php?page=photo-2

- If now I click on <Administration> then an empty page appears from
http://photo.mysite/admin.php 
By the way,
.../admin.php?page=photos_add&section=direct 
is still working but you need to write the address manually.

- If all the pics are deleted then <Administration> is back to work.

What is the cause of the problem? I'd very appreciate any recommendations.

Separately:
It is unsafe to <Start Tour> because after Album section it will lead to unstoppable multiple reloading of the page: 
http://photo.mysite/admin.php?page=album-
If this happened then only click on “x” near the web address and then click on <Log Out> can stop it. Nothing else was useful to stop the flashing.

Thank you for any help.

Installation info: http://photoart.ddkconnections.com/phpinfo.php
Access:
chmod -R 775 photo.mysite
chmod -R 777 photo.mysite/_data
chmod -R 777 photo.mysite/plugins
chmod -R 777 photo.mysite/themes
chmod -R 777 photo.mysite/upload
chmod -R 775 photo.mysite/local
chmod -R 775 photo.mysite/local/config

Piwigo version: piwigo-2.7.4
PHP version: 5.4.16
MySQL version: 5.5.41-MariaDB
Piwigo URL: http://photoart.ddkconnections.com