2017.08.30 17:38 "[Tiff] problems saving BigTIFF format", by Roger Leigh
What does file(1) show for your files, both regular and bigtiff?
What does tiffinfo show?
If you want to put the files somewhere for download, we can take a closer look at the structure.
I'm using w8 and have not encountered problems. I wrote them with ome-files (C++) using libtiff, and read them back in with the same, plus Bio-Formats and Fiji.