Second deselection of column, on deselects column for some events.
Open a default trace. Click on Stored Procedures and Select evnet Category. Now right-click ClientProcessID and deselect it. Works fine. Next try to unselect ApplicationName. But this time the columns is only unselected for some events.
Deselecting columns in some order shows that it is only the first column that is deselected that is handled correctly.
The workaround is to deselect per event.