#371031
All grey could mean a few different things -- is there anything there at all? If so, is there a toolbar near the top? And if so, are you able to select a material from the dropdown list? How about if you select a material by clicking in SketchUp's material list, or by selecting the paint tool, holding the ALT key (to show the eye dropper), and selecting a material from a face? Or, you could try activating the plugin's Material Picker Tool (from the Plugins > Maxwell menu).

Please let me know if any of that helps, otherwise, please post a screenshot of your Scene Manager.
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