Cubase 13 Load Fail on Mac

One of my projects is failing to load, but others are fine. Cubase pops up a window asking for the download directory, and then freezes, so I have to use a terminal window to kill the process. I’m pretty sure I haven’t changed anything, so I’m puzzled. Thanks to the forum I understand that plugins can cause problems, and I can get safe mode to work without them, but the failure happens if I try again normally. Suggestions would be very welcome.

Ignore me! - I discovered a dodgy USB connection to an external drive. I still reckon the total freeze is a bug, but I’ll survive. Sorry!