To begin with, I don't want to suggest that there's a conflict between the two organizations, since Martin Necas ultimately wasn't traded to anyone.
The evidence is that Kent Hughes has just made a deal with Don Waddell, who was the GM of the Canes in recent years, and it went very well.
We now have confirmation that there is no tension between Don Waddell and the Canadiens, which is a good thing. We don't have confirmation that there is no longer tension between the Hurricanes and the Canadiens, but we know that Tom Dundon, the owner, has a long memory.
Time will tell if the conflict persists, but at some point, the past needs to be left behind. The management of the Canadiens has changed, and so has that of the Hurricanes. If their owner continues to block opportunities over an issue that dates back several years, it will undoubtedly be detrimental to their team.