Unfortunately you'll need a Netflix account that allows "Watch Instantly" to try it.
http://www.netflix.com. I would let you use my account, but I don't think it will work for you as Netflix limits the number of computers that can use "Watch Instantly" to 4, and I've already used 4. If you have remote desktop support software where you can access my computer, then you can at least see it happening on my computer...not sure if this is useful to you or not.
Only Netflix streaming media has this problem for me. I don't use a lot of other streaming video, but from the little that I have used, like YouTube, I've never had this problem.
Netflix's "watch Instantly" seems to be very finicky. Occassionally, even with KAV plug-in turned off, I get the error. Maybe 10% of the time. With KAV turned on, I get the error 100% of the time. The error *always* occurs immediatly after clicking 'play'. Once the video begins streaming, errors never occur.