Hello, I have issues with the Modify box. When I double-left-click a dimension number, the "Modify" box does not appear. I read https://forum.solidworks.com/thread/115224 but it does not matter whether Instant 2D was on or off (grey or white). The "Input Dimension Value" box in Settings > General > Input Dimension Value is checked. What is wrong? I am using SolidWorks 2017 Student Edition.
Also, when I first began using SolidWorks, the Modify box appeared as it should. About the third time I used SolidWorks the Modify box stopped appearing. Interestingly, the Modify box still appears in Tutorial mode.