Thanks Guy.
I also posted a similar question on Microsoft's Analyzer forum and got the following response:
"Was it on a wireless interface?
Wireshark is missing dissectors for the wireless frame we use when
the built-in NDIS driver captures the data. There might also be some
other kinds of ETL traffic wireshark can't parse, but the TZSP protocol
is something I've seen with wireless data."
(on http://social.technet.microsoft.com/Forums/en-US/messageanalyzer/thread/25dcf65d-0d18-4d11-b25a-a5d3aa4a81e9/)
With all that being said, is there a plan to fix this?
Thanks.