I have found a temp work around, though less than satisfactory. Involves setting the drives in a manual scan; running it; then aborting it - then setting up the schedule. Apparently it stores the drives last scanned as the scheduled full scan parameters. Not sure what happens if you subsequently edit the time/date/frequency after the Full Scan setting have been changed. Does it store the new drive settings or keep the original? Malwarebytes developers need to add this basic functionality into the app. and soon. I understand that users were raising this as an issue in 2010. This is standard scheduling functionality for programmes like Acronis, Kaspersky etc.