Because the TT Library runs in the background, issues are usually related to version conflicts.
Some old tutorials tell you to manually place a folder called Fredo6_Loader into your Plugins folder. Do not do this with modern SketchUp. Use the Extension Manager to uninstall all versions of TT_Lib. Delete the TT_Lib2 folder from your SketchUp/Plugins directory manually if it remains. Then do a clean RBZ install.
Because the TT Library runs in the background, issues are usually related to version conflicts.
Some old tutorials tell you to manually place a folder called Fredo6_Loader into your Plugins folder. Do not do this with modern SketchUp. Use the Extension Manager to uninstall all versions of TT_Lib. Delete the TT_Lib2 folder from your SketchUp/Plugins directory manually if it remains. Then do a clean RBZ install.