Buongiorno a tutti.
Da ormai un mese mi è impossibile accedere alle varie sezioni del mio blog (nonostante la homepage continui a rimanere visualizzabile).
Mi appare sempre questo errore:

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, info@altervista.org and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.
La sorgente del mio .htaccess è:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php [L]
</IfModule>
# av:PHP-upload
php_value upload_max_filesize 20M
php_value post_max_size 20M
php_value max_input_time 300
# PHP-upload