I've been using SweetHome3D as my alternative to SketchUp for my interior design works. I installed the FurnitureLibraryEditor Plugin for SH3D Furniture so I can modify/add/delete items that I don't need. However, I cannot use the 'modify' part in editing furniture. The plugin cashes (or exits) whenever I click/right-click the modify icon.
Similarly, I installed a related plugin which is called TextureLibraryEditor Plugin for SH3D Texture and I do not encounter crashing or exiting of the plugin. I can pretty much add/delete/modify without a problem.