No, I'm not running a chat addon during this test. The screenshots you cant see my mouse pointer, in the first, but its over the dominos tree node. In the second, its over the first subnode.
Look what happens to the chat tabs!
This works will all Ace3 addons I have tried, and I'm tending to think its related to lock up issues I have been encountering. When clicking on a specific node in Prat3's tree which creates a multiselect the client locks up and has to be restarted. If i remove the multiselect, everything works.
The code which causes the hang is currently commented out in Prat-3.0/modules/popupmessage.lua