I had the same today. I was flying towards KPHX and selected PINNG1 STAR to KPHX rwy 26, HOTTT transition. I did my standard check with PLAN display and noticed that the final intercept course was messed up, so I tried to manipulate some waypoints on the FMC to make the approach flyable. Everything froze including the FMC, PFD, HSI, most instruments etc.
As others have stated the aircraft is still flyable so I was able to fly the descent and land manually, but I couldn't even shut down engines when parked.
That needs to be addressed. Don't want it to happen during a long flight.