This is clearly MY problem. Does anyone have an idea of where I should focus my research to resolve the issue.
I opened a case with Sugar Support, and we've determined this is MY issue. Somewhere in a Role, I've apparently set the access to a field in some module to "None". The result is that a Currency field in the Accounts Module where the Role has Read/Write Access shows as "No Access" but the field can be edited by the user. When the currency is populated, the amount shows twice.
This is what the user sees when editing the field:

This is what the user in that role sees after populating the field:

This is what other roles see when the field is populated:

Again, this is clearly something I have set somewhere in the role and I'm trying to find it by creating a new role. I'm setting the new role's authority to match the prior role for each module a few fields at a time then running a Quick Repair and Rebuild and checking to see if I've replicated the issue.
Does anyone have a suggestion where I should focus my attention to find the field permission that's causing the issue?
P.S. I've discovered that there are a few other roles that have Read Only permission for that filed and those roles cannot edit but see the double value.