OK - I'm back to trying to figure this thing out.

After trying the suggested GitHub version I still got a white screen. After MUCH comparing and such, I finally discovered that I can copy almost the entire YOUR_ADMIN/orders.php file. I had to delete line 40 to stop getting the white screen:

$order = new order ($oID);

Would someone care to tell me why that worked? Or if not having it will cause some trouble I am not aware of? I have no idea what it was there for.