green screen/frame...how to stop it??

HI All,

I have just started using Sony vegas 11. I am doing simple text generation over video at the moment and a funky little thing keeps happening. As I am adjusting the overlay text a green frame gets introduced here and there.

why is this happening??

what is the proper way of removing the green frame in turn restoring the original footage??

please advise...and thank you!!!

HI,

I imported mpeg 2 video files and then adding text over the video. Thats actually all I am doing. As I am clicking within the timeline and editing the text green frames seem to be added as a background of the text which covers the original video. Then they will disappear...sometimes. Really funky thing

what am I clicking that is doing this??

thanks