[chrishajer]

@richardjeananders: this addition to the .htaccess absolutely fixed this exact problem for me. I was seeing the same error in Firefox when I clicked on the Tag link in the breadcrumb navigation. PHP scripts were being interpreted by PHP 4.4.4 on the server until I created an .htaccess file with this one line. Now, PHP scripts are being interpreted by PHP 5.1.6. I can’t believe that fixed it. Thank you very much.

.htaccess

AddType x-mapp-php5 .php