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.
Code:
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.