Oh this is confusing me now. I ran
docker run -ti -p 127.0.0.1:8000:8000 -v $(pwd):/home/fenics/shared -w /home/fenics/shared quay.io/fenicsproject/stable:current
assuming I would get fenics 2019.1. However,
fenics@ff101e53b6bc:~/shared$ dolfin-version
2018.1.0
If you are actually running 2019.1.0, then perhaps something with the Expressions class has broken…