For several weeks I have been having trouble synching my three computers with Zotero. No computer signals an error, but attachments are not consistently distributed across them, nor are they consistently uploaded to the online library. I have checked database integrity (which is fine) and reset file sync history according to the suggestions for this kind of trouble, but this doesn't resolve the issue. At the present time I have a pdf attachment that I can see on my local machine, and it will show the file in a Zotero folder; I can open that file with Acrobat so I know it is on my machine and located by Zotero locally. Sync produces a new citation listing in "my library" on Zotero.org and the attachment is listed by name, however there is no pdf link and when I click on what is on the webpage, it gives me an empty note. Sync completes but it does not upload the file. Sync on my other machines completes but they do not download the (nonexistent) attachment, however they do list it as an attachment; it simply cannot be found. So there seems to be some issue where attachments are recognized, and their description downloaded and uploaded, they appear as pdf files, but they are simply hollow markers.

Zotero 3.0.1
Firefox 10
OSX 10.7.3

Many thanks in advance.

JON