This is caused by Eraser being installed as admin-user-shortcut by default. A workaround is to fully quit Eraser.exe (including the system-tray icon!) and restart it as a normal user:
- uncheck "Start as Administrator" within the shortcut properties,
- or launch Eraser.exe directly from disk.
Failing to Exit Eraser through the system-tray icon causes the change to be ignored until system reboot.
Eraser is a great tool for securely wiping files from disk. Drag and drop not always working reliably can be a major nuisance though.