i have the same problem as the OP. if i drag and drop anything it stops midway and says the file is corrupt. if i run as admin, drag and drop goes away, but i can add those same files manually(major pain) and it'll work fine.
i've uninstalled and installed versaworks fresh, deleted temp files, and did pretty much everything suggested....same issue. i reached out to somebody else who contacted Roland and Roland says: "On window 10 you need to run Roland versaWorks as admin or you get file is corrupted or you will not see the cut lines. When you run it as admin, you will lose the drag and drop feature. Roland Japan said its a window security issue and there is no fix. "
there has to a be a fix. these files are not corrupt, and i have hundreds of PDFs and dozens of .VW jobs saved, so this is a big problem for me at least