First, it isn't actually a "quick find". It's a standard FileMaker Find. The "quick find" that scripts the same type of action you get by entering text into the quickfind box in the status toolbar uses a very different and much shorter script.
It would appear that you either copy/pasted or imported this script from another file and that when you did so, several calculations were enclosed in /* comment brackets */ and thus those script steps do not have any calculation in them until you remove the /* and */ characters. This happens when the calculation refers to items that do not exist in the new file.
This is both why your script doesn't find records and why the custom dialog box is empty. (The calculation for it is enclosed in comment brackets.)
But if you want to set up a quick find script, you could do the following:
Perform QuickFind [Contacts::UberFind ]
The script you put up works like a charm.
Yeah I'm modifying someone else's database, and I think they probably did copy paste quite a bit of it, as this is not the first script to have that problem. My filemaker experience is fairly limited, and scripts and calculations are not my forte.