Not sure when it happened, but suddenly hundreds of DNGs are 'invalid'. I cannot edit nor export them and clicking on some normal thumbnails creates a permanent black border covering 1/2 the thumbnail, ruining even grid view.
Some are years old, others just a few weeks old, and seems random to a degree.
I import to DNG but will stop that asap. Very worried about recovering these since they have been on my work drive, backed up to two RAID's and also in the cloud, but since I update often, ALL the backups are 'invalid