[zork]

If its a graphic card issue there is probably nothing that you can do. What helped me on another occasion was a OnShow script. It may not help you here, but its worth a try.

Don't forget to anchor the main frame to UIParent this is important especially for scaling issues.

    local f = CreateFrame("Frame",nil,UIParent)
    f:SetFrameStrata("BACKGROUND")
    f:SetWidth(200)
    f:SetHeight(200)
    f:SetPoint("CENTER",0,0)
    f:Show()
    
    local t = f:CreateTexture(nil, "BACKGROUND")
    t:SetTexture("PATH\\TO\\MY\\TEXTURE")
    t:SetAllPoints(f)

    f:SetScript("OnShow",function() 
      DEFAULT_CHAT_FRAME:AddMessage("ping")
      t:SetTexture("PATH\\TO\\MY\\TEXTURE")
    end)

The script will become active for example when opening and closing the WordMap and on every other occasion where the UIParent runs the OnShow event.