Software is using the same plate on all joints after making a change to plating in iSource.

After making some changes in iSource to Plating, now the software plates all joints with the same plate. 

This can happen is the sort order of your plates is no longer in order by cost. 

To reorder by lowest price to highest simple click on the Cost column header to reorganize the plates.

Click on save plate order and relaunch IV. 
Rerun the truss and it should apply the correct plating to the truss: