Delete the Styles.file that is on the server and upload a clean copy from the licensed UBB zip. Ensure the upload is in ASCII, and that it's set to mode 777.
That MIGHT fix the problem.
If it doesn't, post back here. Fan2, if that doesn't work for you, please repost your problem in a new thread, and do read the posting guidelines on why you shouldn't me-too.
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Charles Capps, Moderator, Post-Install Troubleshooting
PLEASE NOTE: Due to time limitations, I do not provide UBB support via email.