I've occasionally had that problem. I think it is because there are so many people trying to access the clips at the same time. Usually, I gave it a day and was able to see the clip.I have Service Pack 2 and XP, so I don't think that is the problem. Which version of Real do you have? There is one that is past RealOne.
Sometimes, I just turn off my computer and start it up again and that fixes the problems for me too.
Three is the perfect number.