yep, i've experienced this problem as well guys. The Plus! Icon flashes when i scroll down my list, and so does my contacts. For some reason when ever i re-log into msn messenger it shows all my offline contacts (i have offline contacts grouped) again even tho i've clicked minimise previously.
If thats not a bug, it should be a feature
Cause it lags the conversation window alot more when an extra 140 contacts are visible with large dp's.
I doesn't lag alot, but it lags definitly noticably, alot more then 6 (it doesn't lag at all).