How do I correctly share an external drive under Lion?

Hello,
I've bought myself a new Mac Mini running Mac OS X Lion and i'm having difficulties with sharing files from an external USB hard drive with Windows users.
To cut to the chase, I can correctly share anything from the local hard drive inside the mac without any issues.  I've got an external drive enclosure with two drives installed which are picked up correctly by Lion without any issues.  The only problem occurs when I try to share them.
Windows users can see the machine on the network and can see the file shares underneath.  However they receive an error stating they can't access the share, with a message at the bottom stating that "The parameter is incorrect".  Now im not having any issues sharing the local Mac drive which is working perfectly.  I'm running an AirVideo server which is correctly serving content from the external drive, and TwonkyServer which is also serving content from this external drive over UpNP without issues.
All the Windows clients are Windows Vista or newer, so Apples changes to SMB file sharing in Lion should not be an issue here.
I say i'm having problems with sharing to Windows users.  However, I have only one Mac and no other Mac's to share with.
A couple of things for your consideration as well.  The external USB drives are formatted to NTFS and i'm using Paragon NTFS for read/write access to the drives.  I also have Sophos Antivirus installed on the Mac.
Cheers.

Well, what do you know.  I plugged in another external drive and formatted it to HFS+ and it shared fine.
Barring some issue with Paragon NTFS interferring, it looks like Max OS X Lion can not share externally attached drives that are formatted in NTFS.
Any clever cookie have a workaround?

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