Unfortunately, that didn't resolve the issue. The exact message received is:
Blocked by Magic Byte Mismatch
The transferred file has been blocked. The content of the file does not match the content type and can not be corrected.
URL:
https://www.dokuwiki.org/lib/exe/css.php?t=dokuwiki%26amp;tseed=1346970453%26.css
File: css.php
Media Type: application/xhtml+xml
Filter: HTTP Response Header Filter