nemomobile/nemo-qml-plugins — pull request #83 by zchydem (2013-02-12 22:01:19+00:00)
Title: Bugfix for loading the same image/thumbnail twice caused loading error.

I'm not sure if this is really a right way to fix this, but at least it fixed the problem. The problem was that if I was trying to load the same thumbnail twice, loading the second time failed.