Hi Ludwig,
We definitely appreciate users who are heavily active in production reporting issues to us. We understand that it takes effort to troubleshoot and log issues when you have production deadlines.
Regarding the issue you reported, so far the assessment is that this is not new to Foxboro since Dan was able to reproduce it even in X3. According to the report it has to do with grouped buttons and freezing tracks. Nothing relevant that we know of has changed in this specific area in Foxboro, so its possible that you are running into it based on a specific sequence of operations. Is this accurate?
We will look into this issue for the next update since it is not a regression.
thanks,
Noel