In LabView 6.1, I am using a typedef that contains only a ring control. I want to use it in various places to select processing options. When I add it to the block diagram as a constant, it does not update when the typedef changes. If I put it on the front panel, the update behavior depends on whether it is a typedef or a strict typedef. Typedef allows me to select autoupdate, but doesn't update. A strict typedef allows manual update, but I can't select automatic. I think this is a LabView bug.