[Marco van Herwaarden]

Most likely causes for blank pages:

1. You did not upload the vB files correctly. Reupload the vB non-image files and make sure you upload these in ASCII format and that you overwrite the ones on the server. Make sure you upload the Admin CP files to the admincp directory specified in your config.php file.

2. You have extra space or lines in your config.php file. Make sure there is no whitespace or extra lines in config.php either before the <?php or after the ?>.

3. You have a bad plugin installed. To disable the plugin system, edit config.php and add this line right under <?php

define('DISABLE_HOOKS', true);

4. The servername setting in config.php is wrong. Doublecheck this setting. 99% of the time, 'localhost' is correct:

$config['MasterServer']['servername'] = 'localhost';

5. Your PHP has magic_quotes_sybase turned on. You have to run this off. On *nix systems you can do this by creating an .htaccess file with this content and placing it in your main forum directory:

php_flag magic_quotes_sybase 0

6. [For multiple white pages] You have added code to your header, headinclude or phpinclude templates that is no longer functional.
[For white pages in a select area] You have added code to one of your templates that is causing this problem.

7. You have a corrupted template. Repairing the template table may help:

REPAIR TABLE template;

8. You have GZIP enabled. Try turning GZIP off here:

Admin CP -> vBulletin Options -> Cookies and HTTP Header Options -> GZIP HTML Output -> No

Or by running this query:

UPDATE setting SET value = '0' WHERE varname = 'gzipoutput';

Sometimes this problem is caused when your server is already using GZIP and by turning this on in vB you were double compressing. This causes problems with some pages but not others. It also happens to some people and not others.