The Problem started after replacing the HPLC Pump from Quaternary to Isocratic pump due to pump failure. The configuration was set as the previous set up as Modular 3D LC System and the license for 3D and Isoabsorbance plot is still valid as evident by the presence of spectra option in the toolbar. However, the isoabsorbance and 3D plots are missing in the dropdown menu for spectra as shown in the attached figure. Does anybody have a solution to this problem please?