Reply To: MakeGrid.jsx isn't working in my copy of CS3 InDesign

El, it's possible some other script switched off “User Interaction”, to hide all dialogs and messages while a script is running. Of course, the script should have switched it back on at the end, but perhaps something went wrong (and you'll never know, because you won't have seen the error message either). Or perhaps the script writer simply forgot.

If you suspect this might be the case, you can run a single line script to restore the normal mode, so you don't have to restart ID and loose all your custom settings. This is further discussed in https://forums.adobe.com/message/1973478

(And if you are certain which script causes this to happen, you might be able to fix it.)