Problem
When running a Backup to Disk job it's stuck in a QUEUED state or when you inventory the B2D device it will get stuck at certain %.Solution
- Go to Devices, select your B2D folder and sort by Appendable Until. Sort and look for Not Appendable (End marker unreadable).
 - Find the files and note the B2D####
 - Right click, Associate with Media Set... Select Retired Media
 - Go to Retired Media and Delete it
 - Go to you B2D folder destination and delete the B2D#### files noted that had the end marker unreadable.
 - Now run an inventory on your B2D device
 - Run a good backup :)