There are some standard things you should check.

#1 is the e-onsoftware folder in "images" on all machines? In old versions when this folder is missing the result is a black image, as you describe it.

#2 Does the Cows (all of them) have the same build number as your Vue? This is important and i knopw that on Mac the automatic update of cows not always works as it should!

One day your ship comes in - but you're at the airport.