Looks like I've got a similar problem as topic below: I cannot see Disk space in Dashboard
None of the suggestions look to work
@JMSolo @gmantakis : Do you know the resolution what worked there?
Try to install QuickBox without Quotas and select as a mount point the root path which is /
Tell us if it worked.
Diskspace widget had worked before btw, does that shed any light on your suggestion? I did not setup quotas.
Are you using a /home or /(root) partition?