Created attachment 106262 [details]
Screen shoot of problem
WebKit Version 5.1 (7534.48.3, r94487) is not displaying the .Mac photo gallery thumb nails, only place holders appear. At the individual album level the holders are not displayed. Happen a couple of days agao
Regression range r94444-r94448, meaning that it's http://trac.webkit.org/projects/webkit/changeset/94445 (Use bump allocator for initial property storage).
That patch has been rolled out in http://trac.webkit.org/changeset/94522, so the problem should be fixed in current nightly.