IPS Preventing YouTube Buffering

For some reason YouTube videos are not allowed to buffer completely. The IPS Live Log shows the following line:

2012:11:26-22:24:35 asg snort[6976]: id="2101" severity="warn" sys="SecureNet" sub="ips" name="Intrusion protection alert" action="drop" reason="WEB-CLIENT 3ivx MP4 file parsing cpy buffer overflow attempt" group="500" srcip="173.194.53.153" dstip="192.168.12.125" proto="6" srcport="80" dstport="64311" sid="13320" class="Attempted User Privilege Gain" priority="1" generator="1" msgid="0"

I am running ASG V8.307 software appliance on a PowerEdge 2850.

I guess I have a few different questions: Why is this happening? I have never had a problem with it in the past. Is it OK to disable that IPS rule? Should I try to make an exception? Do I have something set wrong?

I appreciate any help I can get on this!

Thanks.

-Phil