There is a bug in the newest release. If you pin the Live link window to stay on top you can not undo it. Clicking on the thumbtack button does not release it. It stays on top the whole session.
I just saw your post went unanswered, sorry about that.
I am not able to reproduce this with Vantage 3.3.1. Are you still having this issue? Anything specific about it, e.g. only happens in live link or something?