Brien Bastings:
Before the call to ReplaceElement, try calling mdlAssoc_getPoint, and use the returned location to update the cell origin. The dependency callback is likely un-happy with the initial/inconsistent state of your cell.
OK - Don't fully understand why, but your recommendation was "spot on" !!
What I'm after eventually, is to be able to "select" the cell element and read the association to get the line's ElementID. Will adding an Association to the cell origin allow me to grab the line's ElementID from the header's Dependency Linkage? Or should I accomplish this some other way?
Thanks,
Bruce