Weird, I have already changed the whole settings parsing to proper JSON handling and changing these fields never got me into problems. Were you upgraded from a very old version or have reverted to an old version?

You should have noticed the format migration code and these kind of things should be handled there instead.

@ClassicOldSong I can easily reproduce this on the fresh installation of version 0.4.6.

1. Fresh install
2. Set initial password
3. Pair first device
4. Change Language
5. Save and Apply
6. Login again
7. Change password
8. Login again
9. Change language
10. Save and apply
11. Apollo is not starting

After this operation content of C:\Program Files\Apollo\config\sunshine_state.json

{
    "password": "[REDACTED]",
    "root": {
        "named_devices": [
            {
                "allow_client_commands": "true",
                "always_use_virtual_display": "false",
                "cert": "[REDACTED]",
                "display_mode": "",
                "enable_legacy_ordering": "true",
                "name": "Mac",
                "perm": "119480064",
                "uuid": "9D2B43B6-AACC-510E-C417-029F89C51463"
            }
        ],
        "uniqueid": "C9E57A7A-04A9-ED0B-F71E-BAF1C6E09943"
    },
    "salt": "HM5xwNFijUhDEp2o",
    "username": "apollo"
}

On the other hand I think boost::property_tree library does not output typed values in JSON and we always end up with string. So even when other parts of the code created boolean values it will just drop all the types and replace with string during password change.

So

I think I have replaced all the occurrences of boost property tree...

Anyway thanks for finding this out!