Zotero 2.0 does not work for me

I installed. But a click on the zotero icon (lower right-hand corner) or a click on Zotero under Tools (or ctrl-alt-Z) does nothing at all.
I can manage as an add-on (Tools > Add-ons) and was able to change the icon from "zotero" to "Z". But the icon, in either form, does not respond.

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