Nate Always use the same runtime as the version exported from. Even if it works sometimes, it is not supported. If you save 4.2 JSON from 4.3, import it into 4.2 and export from there before using it with a 4.2 runtime.
Misaki phtcloud Thank you for reporting this issue! This seems to be unrelated to mesh attachments, and occurs when the Wind value is set to anything other than 0 in the physics constraints setup. We greatly appreciate your reporting the issue, but in the future, it would be helpful if you could report other issues in separate threads so that we can keep track of them more easily. I have created an issue ticket to fix this problem: EsotericSoftware/spine-editor915
