Anyone following this report over on the D200 forum at dpr? Funny thing is that today when I was stacking TC's, using an AFS lens (still set for af/M), I was able to replicate the problem. But the rest of the day of shooting and as soon as I changed to manual on the camera and lens ,no problem. (thats camera reports battery drained and you get several black frames). If I had been using a system that I knew was "on the edge" this would have concerned me. But It also makes me think that this problem is related to lens and currents in the connection. But I've got a year if it appears again, however do you know about the Dead Battery and blank frames issues on the D200?