Thanks for the specs. I already have the Realtek High Def driver
version 6.0.1.6767.
The issue seems to be related to using keyboard shortcuts in Flash. You're right, it is not consistent. I experienced this problem months ago and then nothing. Then I got tired one day and was hitting the wrong F keys when I wanted to advance the timeline. In both instances, I hit a wrong F key and there was an immediate result. The inconsistency in these cases was one file retained the same issues no matter if I closed Flash and reopened, while the other reverted back to streaming when I reopened the file.