The behavior of the "Zone Views" (Key, Vel, Chain) in the Instrument Rack are all messed up.
I have a Drum Rack with an Instrument Rack on some of its slots. The Instrument Racks contain multiple Simplers.
The Zone View on the Instrument Rack on Drum Slot 1 is set to "Hide".
The Zone View on the Instrument Rack on Drum Slot 2 is set to "Vel".
Currently you should be looking at the Zone View on Slot 2, you see the Velocity Zone Editor.
If you select Slot 1, You will see its Velocity Zone but the Instrument Rack is still set to "Hide".
If I click "Hide" again, the zones will be hidden. If I switch back to Slot 2, the zones will also be hidden but the Instrument Rack will still be set to "Vel".
And so it goes on... Easy to reproduce.
7.0.3b3 // Osx 10.5.2 // Intel mac