Not sure if it's a conflict with another plugin, but after install and experiencing the issue, I did a save permalinks again to be sure, but every time I try to save the configuration, I get a 404 page not found.
Looks like a good plugin though. Too bad it didn't work for me.
I can't recommend this as it wouldn't generate the thumbs. The other two plugins I tried (YARPP and Zemanta's) did without a problem.
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