We've had a rash of these, unfortunately.   And actually, the best way to recover from this may be to do this: Take the drive offline in disk management Turn off all pinning in the CloudDrive UI Clear the local cache, and wait until it's down to 0 bytes (literally empty) Bring the cloud drive back online from disk management You may need to repeat step #3 a couple of times to get this to work   If that doesn't help, then CHKDSK or data reco