The arrow is not the problem. As of version 10 a green arrow only indicates, that a divice (B2D, tapedrive or loader) is doing something (reading, writing etc.)
In your case the problem is, why is the job not running.
If the job would run, the green arrow would still be there.
Try to cancel the job.
Delete the B2D divices within the BE GUI. (you will have to reassign another drive to all jobs using this B2D folder.)
Do NOT physically delete the folder and the files in the filesystem.
Recreate the same folder in BE GUI and run an inventory on the folder.
If that worked, restart the job.
Hope it helps
regards
uz