That does not sound good - could you try run jstack against JBDS to get info on what threads are running at the time of the "livelock" ?
The difference between Windows 7 and 10 is weird too but need more info (like the jstack) above to hunt it down.
On first glance it sounds like some bug/racecondition around the opening of SY editor so could you try start with a new workspace and see if it lets you start then ?
In any case, best way forward is to open a bug at Agile Board - JBoss Issue Tracker and we can help you from there.
Hi, I was on the point to upload the file showing the result of the execution of the jstack. But this web site doesn't allow one to attach a file. Hence I uploaded it using Create->upload function, which has uploaded the file without any reference to the present case. So I don't know if you'll find it.