OK - style is correct, but somehow there's a bug in how it's processed, I'll follow up with the csl team and hope to have that fixed in the next version of Zotero.
Let me know if this is urgent, there is an existing workaround, but it's a little complicated so unless you're in a hurry likely not worth it.
Example:
Rancière, Jacques. _The Emancipated Spectator_. London: Verso, 2009.
Should be:
Rancière, Jacques. _The Emancipated Spectator_. Trans. Gregory Elliot. London: Verso, 2009.
I hadn't encountered this error before; perhaps it was introduced with the recent update.
best,
s.
Let me know if this is urgent, there is an existing workaround, but it's a little complicated so unless you're in a hurry likely not worth it.
http://forums.zotero.org/discussion/18842/csl-processor-bug-editor-translator/#Item_1