Earlier I created this thread, which I´ll link here for reference, but it didn´t result in much useful response.
I´ve posted the contents of the nvidia-bug-report.sh script over here. I couldn´t use startx – --logverbose 6 though, as it didn´t start Unity properly.
The contents of my /var/log/nvidia-installer.log is here.
If more info is needed, I´m happy to supply.