I have created a custom ribbon for excel, and I was recently toying with Combo boxes & drop downs, and I accidentally uploaded the XML before I added subroutines in the VBA modules to account for "getItemID", "getItemLabel"...etc. specific to combo boxes. And so when I opened a new instance of excel, it gave me a debug message and for some strange reason it placed my custom ribbon before the home tab.
<tab id="RealEstateTab" label="Real Estate" insertAfterMso="TabView">
It doesn't matter what I type in this line of the XML, it never changes from acting like insertBeforeMso="TabHome"
I have a feeling it may be connected to the registry system settings for excel because when I open this custom ribbon on someone else's computer, it places the ribbon after the View Tab just like it should.