http://build.webkit.org/results/Lion%20Intel%20Debug%20(WebKit2%20Tests)/r111273%20(5061)/fast/loader/window-properties-restored-from-page-cache-pretty-diff.html Unfortunately, I do not know when this started due to the state of our tests.
<rdar://problem/11078727>
Added it to the Skipped list in http://trac.webkit.org/changeset/111290
This is a brand new test, therefore a brand new failure, and alarming.