I just noticed another thing:
I first had 7 conversations open and 2 group-convo's
But when they said something in one group-convo the top of another (single-)convo began to flash ><
Don't know if it depends on the group-normal-convo-thing, but it's wrong anyhow
Just found out that when everyone but 1, had left both group convo's those convo's were switched