I am experiencing the problem in FMA16 (v18.104.22.1680) that, when in the script editor, clicking on the cog of a function (for example insert calculated result, but not limited to this function), does not open the settings panel for that function. The panel briefly displays but, before one can click on any field within it, it disappears again. Sometimes it does work and I have discovered one possible cause in that this occurs when the solution window is maximised to full screen. Minimising solves the problem, even when one again maximises to full screen. This is on an iMac running High Sierra (10.13.4, although it did this on the previous update, so not related to the latest version).