ToolBox shows a message No tools are available
I am using a version of 7.10 Mendix of windows desktop modeler. when I open the toolbox I am not seeing Widgets and Building blocks under toolBox. This is only happening for a particular project.
Have you tried closing the tool box and reopening it? You can add it again under view > toolbox.
Also when you open a microflow or a page is the toolbox still blank?