Hi Don,
If the top moulding shows in other designs but not in this one it is likely an issue with that specific file. First thing to try is a copy paste of the design to a new file. If that does not resolve the issue you might need to redraw.
If the elevations load slowly with 3d shapes turned on it is usually related to your video card. Make sure that you have a dedicated video card as opposed to an integrated chipset and that the drivers for your card are up to date. If you have a laptop make sure to go into the control panel for your video card and set it to always use the dedicated card rather than letting the computer or the software select whether to use the card, the CPU or the chipset.
Neil
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