Then try looking at this page: http://codex.wordpress.org/Editing_wp-config.php#Increasing_memory_allocated_to_PHP it solved the issue for one person, it may help you as well!
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Custom Post Thumbnails
Along with the new post_thumbnail feature in WordPress 2.9., came the option to register a new post_thumbnail size. add_image_size( $name, $width = 0, $height = 0, $crop = FALSE)
Customising The Default WordPress Theme: 2

Protecting Your Customisations If you have customised the WordPress default theme, all of your changes will be over-written the next time you upgrade WordPress. So you need to protect them now by creating your own custom theme. Using FTP (or whatever file management tool you have available), download the wp-content/themes/default folder to your machine. Rename…
Customising The Default WordPress Theme: 1

Adding A Sidebar To Every Page Within the WordPress Administration area, navigate to Appearance / Editor. Select single.php and change: <div id=”content” class=”widecolumn” role=”main”> to <div id=”content” class=”narrowcolumn”> Then change: <?php get_footer(); ?> to: <?php get_sidebar(); ?> <?php get_footer(); ?> Repeat the last 2 steps for archives.php, links.php & image.php
Choosing The Right WordPress Theme

What Will You Need? First of all, you need to decide whether you’ll be running a web site or a blog that invites comments and discussion. Whilst most themes will work as well for a blog as they do on a basic, no discussion, site, you don’t want to find out that your comment display…

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