I have two PCIe SSD's in my cMP - a boot drive (OWC Accelsior, slot 2) and a media drive (SM951, slot 4). I installed Mojave about a week ago - everything has been fine until now. I restarted the machine yesterday and shortly afterwards found that the project I was working on couldn't be saved to the media drive. Checked permissions on both drives and found that they're both now read only. Please see the attached pics: Media drive says it's read only but the three owners are all set to read and write. System drive says it's read only but the owners are a mix of read and write and read only. When I try to change permissions it tells me I don't have permission! I'm set up as an administrator. I can choose to ignore ownership on the media drive but it makes no difference. All pretty confusing - does anybody recognise this or know a fix? Is it a Mojave bug? Thanks.