I've been using Fiddler for years, but now, on Windows 7 (64 bit) I cannot get it to monitor traffic from IE 8.
With the Firefox add-on, it is able to monitor Firefox traffic with no problem.
This is not related to monitoring HTTPS traffic, or traffic to localhost.
I've tried running IE and/or Fiddler with "Run as Administrator", but no luck.
The best clue to the problem that I have is that in IE8, the "Local Area Network (LAN) Settings" dialog accessed from "LAN Settings" in the Internet Options / Connections tab is all grayed out.
I have two Windows 7, 64 bit computers, both on the same LAN. One works fine, the other has these settings grayed out, and a note on the Connections tab: "Some settings are managed by your system administrator". However, the system administrator has NOT set any.