Thanks for the tip, I actually found a way around it a few minutes before you posted using a select case block in a formula and letting it make the decision rather than putting the logic right in the parameter field. I also used strings instead of booleans...
Just to see if I understand what's going on here though, originally I was adding the if statement as shown to the select formula. It correctly selected producing wells but if you chose "no" it returned no results, because there was no else clause to handle anything other than "yes". So naturally I was trying to figure out a way to say "else, select all" or something to that effect. Eventually I realized I was thinking more in terms of a formula, not a select statement, which is why I went that route...
I guess the question I'm getting to is this: in Crystal, is it incorrect to put logical or conditional statements in the Select Expert?