My colleague (in the UK) and I (US) both have "clean" installs of Mac OS Sonoma on completely different machines and environments. I'm using an Intel laptop booted directly into Sonoma and he's using a virtual machine on an M1 Mac. Neither of us can mount .dmg virtual disks. Our own .dmg files (https://macvector.com/SacI/macvector18.6installer.html) fail with a permissions error as do many third party files. e.g. TinkerTool (https://www.bresink.eu/download2.php?ln=1&dl=TinkerTool&MBSKey=5b8ba58ae0201358ff218dffe7a87eb8) or DMG Canvas (https://www.araelium.com/dmgcanvas/downloads/DMGCanvas.dmg). Has anyone else seen this?? Kevin