Rhino 5 to Keyshot 7 livelinking odd behavior

[ldpinc]

Sending file from Rhino 5 (64) Win 10 to Keyshot 7 -- works fine. However when I make a change to an object in Rhino and send to Keyshot via livelinking some objects disappear -- if I make another change something may reappear and other objects disappear. No clue, all objects are visible in Rhino any ideas to help.

Dan Lewis