I received a new V2 dimmer from Smarthome and conclude that the fix that SmartLabs has put in place consists in increasing the number of turns of the largest inductor ( ~T68 =~16mm =~ 0.68" outside diameter toroid core) from 4 to 12 turns as I noted above. The color of the toroid core (green) has not changed, so it doesn't seem that they changed the core's composition. (ABIK, there is no standard color code for composition that is consistent between manufacturers.) As I also noted above, this makes the inductance comparable to those in other residential dimmers. The 'fix' also has the minor added benefit of somewhat reducing noise put on the power line that can then also be radiated as RF.
Because inductances in series are additive (like resistance) one can accomplish the same thing by adding a choke _outside_ the dimmer case. This was apparently contemplated by SmartHome / SmartLabs, but to their credit, they decided against it -- at least as the only 'fix'.
Of course a home owner could decide to do it herself adding an inductor made from a core with an OD =>~1" and appropriate material (~$1.50 each at e.g.
There are also commercially available lamp debuzzing coils (google) but these are bulky and relatively expensive and more than what is needed to solve the flicker problem.
So this tempest-in-a-teapot would seemingly have been avoided if SmartLabs had put 12 turns on the core to begin with -- although it remains to be confirmed that this fix definitively eliminates all flicker problems. I have no INSTEON loads that flicker and haven't tested this.
... Marc Marc_F_Hult