zotero connector not recognizing pubmed pages

MacOs 10.7.5, Google Chrome, Zotero standalone 3.0.8., zotero connector for chrome (extension 3.0.8.1)

When I landed a pubmed page like http://www.ncbi.nlm.nih.gov/pubmed/22235111 I was always offered the possibility of saving to zotero. Zotero connector would offer this by showing the small icon in the address bar next to the link.
Today this stopped working.

However, if I go to the same article on the publisher website, it works.

http://www.jbc.org/content/287/13/10650.abstract

Thus zotero standalone and its connector are working, only they don't recognize a pubmed link anymore. Restarting did not help.
Is anyone else noticing this?

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