*#-BUG-#* Blank screen after submit of anything.

Hi Pat,
The first thing I would check is the memory limit for PHP. Your host usually sets this and you may need to ask them to increase the memory limit for your domain/account. Sometimes you can change it by adding a setting in your .htaccess file. You can check what the limit is yourself by creating and uploading a file named something like "phpinfo.php with the following code in there:

<?php
phpinfo();
?>

Then point your browser to that file like: http://yourdomain.com/phpinfo.php

Then look for a line that says:

memory_limit	32M	8M

If the number is very low then that is likely the problem.

Check your Drupal .htaccess file in your root folder for the following lines:

# Override PHP settings. More in sites/default/settings.php
# but the following cannot be changed at runtime.

# PHP 4, Apache 1
<IfModule mod_php4.c>
  php_value magic_quotes_gpc                0
  php_value register_globals                0
  php_value session.auto_start              0
</IfModule>

# PHP 4, Apache 2
<IfModule sapi_apache2.c>
  php_value magic_quotes_gpc                0
  php_value register_globals                0
  php_value session.auto_start              0
</IfModule>

# PHP 5, Apache 1 and 2
<IfModule mod_php5.c>
  php_value magic_quotes_gpc                0
  php_value register_globals                0
  php_value session.auto_start              0
</IfModule>

And change it to something like this: (the memory_limit is the important one and the others are in cause you are uploading large files. Feel free to change the number higher if needed)

# Override PHP settings. More in sites/default/settings.php
# but the following cannot be changed at runtime.

# PHP 4, Apache 1
<IfModule mod_php4.c>
  php_value magic_quotes_gpc                0
  php_value register_globals                0
  php_value session.auto_start              0
  php_value memory_limit                    64M
  php_value post_max_size                   20M
  php_value upload_max_filesize             10M
</IfModule>

# PHP 4, Apache 2
<IfModule sapi_apache2.c>
  php_value magic_quotes_gpc                0
  php_value register_globals                0
  php_value session.auto_start              0
  php_value memory_limit                    64M
  php_value post_max_size                   20M
  php_value upload_max_filesize             10M
</IfModule>

# PHP 5, Apache 1 and 2
<IfModule mod_php5.c>
  php_value magic_quotes_gpc                0
  php_value register_globals                0
  php_value session.auto_start              0
  php_value memory_limit                    64M
  php_value post_max_size                   20M
  php_value upload_max_filesize           10M
</IfModule>

I hope that helps,
Chris

ALIAN DESIGN

All (most) core files and theme files are saved in UTF-8 format (2 bytes per character). If you edit on of these files with an editor that does not handle UTF-8 and especally if the file starts with <?php the odds are it now has "unexpected" characters that cause problems.

Good point duckxtales,

For me the problem was a blank space in my template.php file after the last ?>

Alex
----------
Contract Web Development

I found out that if there are files in different encodings on the site, then it gives blank screen. In my case it was utf8 files with ANSI in module VIEWS (because I edited them, without looking at the encoding).

So check that ALL FILES are in the same encoding (For example using notepad++). Hope this will help.

Sorry for my English, I hadn't practice for a long time.

None of the above helped me. Instead, I had to delete the content of a search index table. My actual problem source was a node with the PHP input format that contained a die() call, and I assume a PHP sytax error would cause the same problem.