Hm, I'm not having this problem, it never switches to another tab. But the other tab is just flashing, there is no sound. Using it with msn 6.2, 7.0 and 7.5.
Another thing with 7.5 is that when someone is changeing his status, I won't see it in main window, also floating windows on desktop are not showing it. Then, when the person is changeing status back to online, it shows me the previous status he just had. When I disable plus!, msn is showing statuses right.
And yes, I'm using the beta v. of plus! too
/ 
