I'm currently aware of 2 problems related to Nemesis:
1) Since Furore's are currently broken, it's impossible to complete wither of these tasks...
"Carry out espionage two times during a Carousel Furore at The Battery Boardwalk"
"Sabotage the Helter Skelter at The attery Boardwalk during a Carousel Furore"
2) Cashing in your Nemesis reward is currently broken.
Since it's taking longer than expected to fix the Furors, I'm planning to switch the missions for everyone currently stuck on #1.
I think I can fix issue #2 today.
Are there any other known issues?