Hi,
I used Logos 5 to try to find all instances of πᾶν ἔθνος (sg.) in NA27, regardless of the form (genitive, dative, etc.). So I did a Word Study on ἔθνος and used the "Grammatical Relationships" which, sure enough, had an entry on πᾶς, used adjectivally with ἔθνος. I scanned through the 23 results to spot the grammatical singular instances. When I cross-examined the results with BibleWorks 9, I noticed that Logos missed Acts 2:5 and 10:35 (and both programs missed Rev 5:9 and 13:7!). Does anybody know why these instances would be dropped from the search results in Logos 5?