Thank you for the screen captures.
I could track that in the compiled version of Brainstorm, the default montages where indeed not read anymore. I fixed this and recompiled Brainstorm:
- https://github.com/brainstorm-tools/brainstorm3/commit/b80827904298b55bcda9f7c9950e16e35b987d73
- https://github.com/brainstorm-tools/brainstorm3/commit/a0429ae8e6d9b51747d7876c0b309c43df8bd4f6
Please download the updated version from the Brainstorm website and try again.