Just noticed an issue with one of my tools in Arc10 where it checks a layer to see if it is editable and getting a true result even though I'm not editing any data. This same tool worked for years in Arc9.3.1. But in Arc10 (SP5), IEditLayers.IsEditable appears to always return true when you are not editing any data. It does return false if you are editing in a workspace that doesn't include this layer. The work-around is to do two checks. a) Am I editing anything and b) is the layer editable.
I haven't checked this behavior in Arc10.1.
