[commercial doors suddenly won't drag/copy]

I have AeonVox commercial doors I've used for several years.  Normally when building, I link two doors to a prim with its repeats set, then drag a copy to use for the next doors.  For the past few days, when I drag a copy, the copy doesn't work for me, although if I sell the linkset to someone else, it works for them.  The creator, Kenn Nilsson, has left SL, but why won't the copy work for me?

[V3 and 64m prims]

I've just completed a build using viewer 3 and the new ability to stretch prims beyond 10m.  Now her sim is incredibly laggy both in moving about and in typing.  Could the two be connected?