seq++ doesn't seem to load my seq_user_keys.json file

[bram2000]

I've created a very simple seq_user_keys.json file but it doesn't seem to take effect. I've run rack from the command line with -d and I see this but nothing about my key mapping.

[7.343 info src/app/Browser.cpp:89 chooseModel] Creating module Squinky Labs Seq++
[7.343 info src/app/Browser.cpp:93 chooseModel] Creating module widget Squinky Labs Seq++