Derek:
You are not doing anything wrong.
The Carbonite 1A has only 4 keyer resources in total available.
When you activate the MiniMEs it uses two switcher's keyer resources and devotes those to the MiniMEs. (
MiniMEs Key 1 and Key 2). Note that ONLY MiniME key 1 can be a DVE key within the MiniME, if you select it to be a DVE key, then the total switcher DVE keys are lowered by one.
Do a search on this forum for MiniME, read the post from Dave 4 days ago - Nigel responded to his question with a PDF file link that may help you understand a little bit more about how Ross processes the video signals.
#Carbonite