Help! can't change difficulty after finishing act 5 (V5.03)

[fsping]

first, thanks for the wonderful mod.

After killing baal and getting the "victory token", I still can choose "normal difficulty".

Is anything I forget to do?

[GrandMaitre]

The last version is 6.00 public beta.
5 .03 has not nightmare. mod is still in progress

[fsping]

I see. thank you!!