Previously when I tried to check out the tutorials it gave me a totally white page with an 'access denied' message. But after clearing my cache (old internet files, cookies, etc.) it gave me a blue page with the 'access denied' message.
Does anyone know how to solve this problem?
sysadmin: sounds like you accidentally got logged out. If you cleared cookies/session data, that might do it. I just went in as an authenticated user to check and all videos played back OK. If you run into this again, contact me offline at firstname.lastname@example.org. Describe the incident as best you can ,and provide the time and URL you were on if possible.