How to use it with GMaster is documented here.
How to use it with SemanticMerge or Plastic SCM is described here in chapter "How to invoke Semantic with an external parser".
Please raise issues on GitHub. If you can repeat the issue then please provide a sample to make it easier for me to also repeat it and then implement a fix.
Please do not hijack unrelated issues, I would rather you create a new issue than add noise to an unrelated issue.
Following images give an impression about the different diff results.