I am using MAC OSX 10.5.8, the latest version of Zotero and Microsoft Word 2008 using *.doc documents. I have found the following bug using this and the previous version of Zotero.

I am using nature style references (with superscript numerical references within the text body). Adding several references at a single place in the document works fine, and if the 'Keep sources sorted' check box is selected then the citation numbers will appear in the correct order in the main body of the document (e.g. 1,4,5). However, there is a problem when I go back to edit those citations. When I do that, the 'Keep sources sorted' check box just doesn't appear. I can add a new citation to that location okay, but unless I'm lucky, the numerical list is out of order. e.g. I start with 1,4,5. I add 2, but it appears as 1,4,5,2. Why does the 'Keep sources sorted' check box disappear?
Thanks