WordPress Problems
I recently had some wordpress problems with one of my WordPress blogs and I have decided to write this post because I think that my experience might be userful to some of you.

WordPress Blank Screen
When I invoked one blog by using either the blog url or wp admin url, I just received a blank screen without any message,

I made a few searches on Google and I found that this problem is described as the WordPress white screen of death. This issue is frustrating for users is because it locks you out of your WordPress admin panel. Because there is no error output in most cases, you are left clueless to figure out what is the issue.

I found that most articles on this subject suggested that you exhausted the memory limit. This could also be caused by a plugin that you may be using and that is not functioning properly. It could also be caused by a poorly coded theme that you are using.

Therefore a few suggestions to solve this problem are the following:

Remove all unused themes from your installation
Deactivate all plugins by renaming the plugins directory under the /wp-content/ directory. You can easily do this through the cpanel application.
You can then re-enable one plugin at a time to get to the bottom of the issue.

This approach actually solved my problem perfectly.

Moving a WordPress Blog to a different URL
I had another problem when I decided to move a blog from a main domain that I didn’t want to renew at a subfolder of another blog.

I moved the directory of my blog to the target sub-directory and, even if the home page displayed correctly, I could not access neither posts nor pages.

I realised that the blog still referred to the old blog url and I vould fix this problem by:

change the definitions of WP-HOME and WP-SITEURL of the wp-config.php file
change with phpMyAdmin the siteurl variable in the wp_options table of the blog database
After having done this, everything worked correctly and the blog was transformed in a subfolder blog.