Yikes!
If you have a script focused in Studio, alt-tab out to another app, then alt-tab back in to Studio… do you happen to notice if that script retains focus? So it would still have a blinking cursor and active line highlighted. I’m just trying to determine if it’s an issue with the Find shortcut not firing when a script has focus (which would be surprising) or if it’s more of an issue of the Script tab losing focus.