Are the new 2 'Boris freebies', one of them is BCC Continuum Lighting?
No problems to me so far... just grab it this morning and had no issue running TP4.
Seems few users having terrible issue on TP4, but on the other hand, it works great on my system..., as I noticed on NBFX forum as well.
The only more common crash I had is when turning ON the secondary monitor output to one of my screen display.