Since update to v 1.9 and 1.9.1 Mendeley won't insert citation into Word

Hello! Since the update to version 1.9 (Mac) I get this error message whenever I try to insert a citation into Word 2011: Problem formatting citation #0 JavaScript error found: CSL error: Exception: TypeError: 'undefined' is not an object, 554, file:///Applications/Mendeley%20Desktop.app/Contents/Resources/citeproc-js/citeproc.js The update to version 1.9.1 did not help either. It is still not possible to insert a citation. Could this have something to do with the fact that I had changed the language I cite in from English to German? Everything (including citing in German) worked fine until the update. Can anybody help me with this problem? Thanks, Linda