Recently purchased a new MacBook Pro and reinstalled my edition of Cubase Pro 9 from the Steinberg website on the new MacBook. After installing software, installing eLicenser, plugging in USB dongle and registering software, seemed to be running fine with no issues.
Was working on a new project this morning; everything was working fine as usual and then Cubase suddenly quit with no warning. Tried opening Cubase again; Cubase seems to load fine and takes me to the hub; I can create an empty project but if I try to open an existing project (either by clicking on ‘open other’ on the hub or by selecting ‘open’ from the file menu) then it crashes. I’ve tried re-starting the MacBook / shutting it down and turning it on again multiple times but the issue persists.
From the Apple error report:
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_PROTECTION_FAILURE at 0x00007ffee9f84b80
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler 
Cubase Pro version 18.104.22.168 (64 bit)
MacBook Pro (16 inch, 2019)
macOS Catalina version 10.15.7
Processor 2.3 GHz 8-Core Intel Core i9
Memory 16 GB 2267 MHz DDR4
Macintosh HD 1TB
Cubase is hooked up to a Focusrite Scarlett 6i6 via USB
Cubase is receiving input from an Alesis Q49 keyboard via MIDI input through the Focusrite
New MacBook is USB-C so Focusrite and Cubase dongle are both hooked up via a USB-3 to USB-C adaptor
MacBook is new last month so apart from Cubase, Kontakt and a few authorised VST plugins there is nothing installed on it except the software it came with
Any help or insight much appreciated.