hi, i had this problem
starts by doing nothing, the monitor and then after a render i can watch "the rain" at videos, all previous projects had this too when i open. i format the pc again but the problem persist. i open in a notebook, but is too slow for load the project. the videos are good when i open with windows media player, and i make more than 5 projects with mov and mts files without problems until this.
hope that u can help me. best regards