I tried IE 11 using a private instance with the latest release with the same results. I believe I’ve seen it working correctly before but I am not totally sure.
I know I had a problem where IE 11 wasn’t reading responses so everything showed up as a -2 so it was on my list to look at (like this: http://www.webpagetest.org/result/140206_68_KQ2/1/details/ ). I’ll take a crack at it today. Looks like they probably just evolved how they read/write to the sockets and schannel and I need to adapt the hooking.
Oh, any chance that that page is SPDY? IE 11 introduced SPDY support and the WPT agent doesn’t have a SPDY decoder yet (been on my todo list for a while).
Sorry it took so long to get fixed. Both the missing requests and the failure to process responses should be fixed for IE 11 now: http://www.webpagetest.org/result/140219_16_11ZJ/ (was never working correctly).