Somehow, all files loaded through WebDAV are flagged as read-only by Word - but they're not locked in Alfresco according to the node browser. Using "edit online" from within Share has the same odd result, although if you access the Share filesystem directly through the files do open correctly. I've never seen this - in previous versions i could load & edit files directly through WebDAV normally. I ran the regedit fix (which is supposedly only necessary for non-trusted sites) and have added the alfresco server to the trusted sites as well.
Anyone have any idea what i have to do to make this work?