Thanks for getting back to me Bartman. See my post above for a possible workaround, assuming you are comfortable logging into the TNAS over SSH and copying a few files around!
Best of luck!
We have verified the issue you mentioned and added it to our repair queue.
Yes wemblykj, its a shame this has gone this far, but I see TMzethar and his team have found the problem, I will hold with baited breath for a fix, but will not hold my breath as what I have seen they take a long, long time to materialise, even not happen