Install Network Monitor
If you encounter a situation where Network Monitor freezes while opening a capture file, try updating to the latest parsers from the CodePlex Parser Site.
A parser issue with SMTP traffic causes the engine to get in a state where we get stuck in a loop. But fortunately this is easy to fix by installing a patched SMTP parser which resolves the problem. Be sure to check the CodePlex site for updates as we try to update them monthly.
Yes Paul, It works fine. It resolved for me as I installed a patched SMTP parser.