Charles,
Details are still not fully clear. Is the Keyer going off air? Or is the source in the keyer changing?
Is the source in the Keyer a Media Store and the image in the Media Store is changing?
are you sure there are not Memories or Macros that are changing sources or state?
Also any chance you have GPI triggers connected to the switcher? There are default GPIs that transition keyers.
Les
#Carbonite