Including selectivizr.js is causing IE8 to not display/render anything at all, but IE8 in IETester manages.
It also downloads everything, I can see that in the activity
The latest version of selectivizr (1.0.2) fixes this issue (look for WSOD): https://github.com/keithclark/selectivizr/blob/master/changelog.txt .
EDIT: I was still having the issue even after updating to 1.0.2. There's something going on between @font-face and selectivizr, even though it doesn't occur all the time. See http://groups.google.com/group/ie-css3/browse_thread/thread/dcc21706fc009af8?pli=1 .