"sep is undefined"
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http://www.zotero.org/support/dev/svn_and_trac_access#zotero_client_dev_xpis
and back
(make sure _not_ to switch to the trunk, which is experimental, possibly won't allow you to downgrade and possibly unstable. The Branch XPI is quite stable and will allow you to downgrade to 2.1.6 if needed.)
To be sure you should make a database back-up, but in this particular case the risk is quasi non-existent.
If you can narrow down the error to a particular reference that causes it, it would be helpful to have an exported copy of that reference in Zotero RDF format. This error is most likely triggered by mismatched or oddly placed quotation marks, if that helps in tracking down the problem item. Obviously this shouldn't be happening, and we'll keep after it until it's fixed.
dgolds: If you can export the citation that causes the error, paste to gist.github.com, save it as a public gist, and post the URL from the address bar back here, I'll take a look and see if I can figure out what's causing this.
(Edit: if you prefer, you can send me a message via zotero.org, and I'll send along my email address so you can mail it to me direct)
Good to know that you've been able to get past the error and back to work.
In order to prevent this error in the future, I'll need to be able to reproduce it locally. The document itself actually won't help; what I need is the content of a citation that causes the problem. If you have identified the features of a citation that cause the error, a description will be enough. Otherwise, there may be a copy of the citation content close to the badTagsPos report line in the debug output.
Une république française "post-coloniale," La fin de la guerre d’Algérie et la place des enfants des colonies dans la cinquième république
For the next test, install this beta version of the propachi-vanilla plugin.
To install the plugin in Standalone, download the *.xpi file, and then in standalone go to tools > add-ons > gear menu (top right), select "Add from file" (I think) and select the file.
After installing the plugin, restart Standalone and start a debug ID; then open the word processor and trigger the error; then return to Standalone and send the debug ID report to Zotero. (edit: and then post the ID back here, of course :)
This error is now very rare, but the cause must be a field or prefix value (a string) that the processor is unable to digest. The plugin should include the string value in the report. That will help you to quickly fix your document—and it will help us to fix the processor (since this error should not happen in the first place).