If you've installed other features on the avatar in addition to Kemono Sprint, there is a chance they might conflict with each other. In such cases, unfortunately, it may be difficult to provide support.

I'm sorry I couldn't be of more help.

Another possibility is that the Kemono Sprint toggle switch in the Expression Menu might be turned off, so please check that as well.

If you're using full-body tracking, please try disabling it. Alternatively, if you'd like to use Kemono Sprint only while moving, please make sure that "Locomotion Animations" are enabled in your VRChat settings.

Thank you for using Kemono Sprint.

It's a bit difficult to determine the cause without knowing exactly what kind of issue you're experiencing, but since it was working fine yesterday, there's a high possibility that something in your VRChat settings may be causing the problem.

簡単な文章でまとめただけなので、今後もセンシティブ設定に関しては迷うと思います。慎重に様子を見ながら投稿しようと思います。