Currently Being ModeratedOct 16, 2013 8:25 AM (in response to ntfuk)
I would be concerned too if I was not able to play videos in iTunes. I recommend reviewing the steps in the article below for the issue you described:
Thank you for using Apple Support Communities.
Currently Being ModeratedOct 16, 2013 3:49 PM (in response to sheila_m.)
Thank you for replying to this.
I actually just discovered that since I started running a second monitor this has been happening. I unplugged the 2nd monitor from my laptop and suddenly the movies play. What's that about?