IMPORTANT: Please provide AS MUCH INFORMATION as you can, and a TEST PROJECT. Even better, the steps to reproduce your problem. A video can help also. Bugs will be fixed much faster if you follow these suggestions, thank you.
Well just like what the topic said, I tried uninstalling and reinstalling, rebooting my computer but It did not solve my problem. And its not with my computer because WMP, Quicktime, and Itunes works perfectly fine.