Nuke crashes on startup when you have CaraVR 1.0v1 installed and a VR headset plugged in.
This is caused by a recent update to SteamVR, which causes a conflict between Nuke and SteamVR.
A fix for this issue is now available starting with CaraVR 1.0v2 and onwards. The latest version of CaraVR can be downloaded from here.
NOTE: Due to a recent update to SteamVR (1485823399) a Nuke crash now happens when CaraVR 1.0v3 is loaded and no headset plugged in to a machine. This has been fixed in CaraVR 1.0v4, please see the following article for more information: