I'm having the same problem with a Buffalo Terastation. Maybe I'm being slightly naive, but surely all that the making the folder availble offline synch process has to do is compare the folder / file structure on the Buffalo with what I have on my laptop and then make saves / updates accordingly. I don't really see why the terastation should care how it's being accessed?
There was an article which suggested I needed to turn off the Recycle Folder or trash can, as this may be causing an issue, not that I understand why. I'll try that but it is annoying.
Also this ONLY seems to affect the majority of .pdf files. I have some Word Docs and Excels etc. and a few .pdf s that it deals with perfectly.
Any help direction greatly appreciated.
Rosco