An der .htaccess liegt es definitiv nicht. Erstell doch mal bitte eine index.php
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RewriteEngine On RewriteRule ^(.*)$ index.php?cat=$1
<?php
echo "index cat: ".$_GET['cat'];
?>
index cat: index.php
index cat: blub
RewriteEngine on RewriteRule !^index\.php - [C] RewriteRule ^(.*)$ index.php?cat=$1 [L]
RewriteRule !^index\.php - [C]
<link rel="stylesheet" href="/screen.css" type="text/css" />
RewriteEngine on RewriteRule ^(.*)$ index.php?cat=$1
RewriteEngine on RewriteRule !^index\.php - [C] RewriteRule !^style\.css - [C] RewriteRule !^script\.js - [C] RewriteRule !^(.+)\.pdf$ - [C] RewriteRule !^img/ - [C] RewriteRule !^download/ - [C] RewriteRule ^(.*)$ index.php?cat=$1 [L]
echo "<link rel=\"stylesheet\" href=\"screen.css\" type=\"text/css\" />";
echo "<link rel=\"stylesheet\" href=\"/screen.css\" type=\"text/css\" />";
RewriteEngine on RewriteRule !^screen\.css - [C] RewriteRule !^/screen\.css - [C] RewriteRule !^index\.php - [C] RewriteRule ^(.*)$ index.php?cat=$1 [L]
RewriteEngine on RewriteRule !^(.*)\.css - [C] RewriteRule !^(.*)\.js - [C] RewriteRule !^(.*)\.jpg - [C] RewriteRule !^index\.php - [C] RewriteRule ^(.*)$ index.php?cat=$1 [L]
echo "<link rel=\"stylesheet\" href=\"/screen.css\" type=\"text/css\" />";
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