I used to be able to mount NTFS drives read-only regardless of whether they'd been shut down correctly... it was only if I manually tried to mount them read/write that I'd get the improperly shut down error. In Gutsy the read/write is default... I believe in Feisty it was not, and this (I think) is almost certainly your issue.  Question - when you mount it in Feisty Live is it read-only? I believe that there is a way of resolving the "improperly shutdown" status on a drive from the command line but I don't personally know the syntax or the risks involved.  Would be much better to simply mount the drive on a Windows box and then shut it down normally and see if that resolves it - is this really not an option? Sean