Can't blame you there.
Well, you have a rare, if not nearly unique, problem in as much as you maintain they were indeed viewable BEFORE copying and AFTER copying were viewable from the other drives.
I wonder if having some AV that 'immunizes' files would have protected them.
gl anyway - sorry for the frustration BUT we all tried to help.

Well, you have a rare, if not nearly unique, problem in as much as you maintain they were indeed viewable BEFORE copying and AFTER copying were viewable from the other drives.
I wonder if having some AV that 'immunizes' files would have protected them.
gl anyway - sorry for the frustration BUT we all tried to help.