Auto import of pdf not working when snapshots turned off

I have set up the following General/Miscellaneous options in zotero:

OFF Automatically take snapshots... (found this wasn't necessary for me)
ON Automatically attach associated PDFs... (would save me a lot of time)

However, zotero never downloads the associated PDFs in any of the databases that I use (e.g. ebscohost and sciencedirect). The PDF download works fine when I have the snapshot option on, however I have no need for the snapshot and would rather not waste the space/processing if I can avoid it as I work from a usb drive a lot.

All other options are ON and I have the latest 'PDF Indexing' plugins installed. I've also 'Reset Translators and Styles' recently to see if this fixes the problem. This has been happening ever since I turned snapshots off, and hasn't been resolved in 1.0.4.

zotero 1.0.4, firefox 2.0.0.14 (also tested under ff 3.0 rc1)
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