I've upgraded to the latest version on Mac, and now get an error trying to save originals to my local NAS. The message incorrectly shows that the storage is full. It's nowhere near full, and I can add 500gb of data in a test transfer in Finder just fine.
I have tried disable/enable of local copy of images. As well as changing the path to the local disk and back again to the NAS.
I have the same problem, with the same checks/tryouts as sushisean above. I have also freed up lots on the Mac's drive as well as the NAS drive, so it's definitely not a space issue of any sort as it tries to move locally stored copies (from when offline) onto the 'Local Storage' location (NAS in my case)