I had a problem start awhile ago (two weeks/a month????). When I choose a video on youtube to watch 50% of the time the video screen is black although the video audio can be heard. Today I experimented and when I turned off my Zonealarm the videos that wouldn't play earlier were then working. I tried several videos that hadn't been working this morning and they all worked today. That tells me zonealarm is causing a problem with youtube's site or flash player, which is the program that shows the video. Does anyone know or have suggestions on what I can do to fix this problem? Thank you.