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Rainer,

There is an .htaccess file on our website. After reading some documentation online I have not found a defiinitive answer but it seems as though maybe I have an idea of what's happening.

This line in the file is what caused Drupal to show the 'page not found' message:

# Make Drupal handle any 404 errors.
ErrorDocument 404 /index.php

And it seems like this is what is causing the webpages (Events Calendar) to be cached and thus requiring the user to click their browser refresh button to see changes:

# Requires mod_expires to be enabled.
<IfModule mod_expires.c>
# Enable expirations.
ExpiresActive On
# Cache all files for 2 weeks after access (A).
ExpiresDefault A1209600
<FilesMatch \.php$>
# Do not allow PHP scripts to be cached unless they explicitly send cache
# headers themselves. Otherwise all scripts would have to overwrite the
# headers set by mod_expires if they want another caching behavior. This may
# fail if an error occurs early in the bootstrap process, and it may cause
# problems if a non-Drupal PHP file is installed in a subdirectory.
ExpiresActive Off
</FilesMatch>
</IfModule>

So. . .I would think if I changed the line 'ExpiresDefault A1209600' to 'ExpiresDefault A0' and upload the new file. . .then that would turn off the caching of all files. Or would something bad happen?

Thanks,
Brian