Quote - Oh, forgot to mention (FWIW) - if I select an existing material in the Materials library I get icons for Apply Preset, Add folder, Delete from library, and Add to favorites. But nothing I do ever gives me a single + icon for Add Material.  When I select a folder in the Materials library I only get the one icon (add folder) as explained earlier.

You should probably submit a bug report to Smith Micro if the + sign isn't showing up for you at all in Poser Pro 2010. I'd also reccommend pestering BillBaggins who wrote the library for Poser Pro 2010.