Under SW2018, when I select the thread function, under the specifications tab, the "type" and "size" drop-down menus are empty, I have no threads offered. Would you know why? And how can this be remedied?
I activated toolbox but it's for the screws it seems to me.
For SW2017, you need to check if the path to the drill helper file is good in the SW options, this one is usually "C:\SOLIDWORKS Data\" (see attached image) of course unless this file is shared on a network drive or in Epdm. Beware of the "SOLIDWORKS Data (2)" that could creep into this folder path in case of incomplete uninstallation of the old version of SW. I guess on SW2018 it's the same.
In the settings, you have to check if you are pointing to the Solidworks Data folder for Toolbox and Drilling Assistance. Normally it uses Toolbox for thread information (using standards).