if you cannot get past the create/join game screen, simply delete the registry file for the voice under nexus server in the registry for nexus

registry:
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Mithis\Nexus - The Jupiter Incident]

what you're looking to delete:
Multiplay_VoiceEnabled=dword:00000000

confirmed the fix by launching a copy on my other computer then joining on my main computer.

needless to say LEAVE THE VOICE OPTION ALONE AFTER THIS.

Hi,

Thanks for posting your suggested fix, however after deleting the key and trying to start the MP server the game still crashes. When I checked the registry I noticed the game has recreated the problematic key.
Am I missing something here?

Thanks for your time!

Could be a permission issue. Try running regedit as Administrator. Search for the program, right-click it and select the option to run it as an administrator.