My pronunciation style (in the pronunciation tool) is set to Erasmian. It works correctly in the right-click menu, the pronunciation tool, and in the lemma section of Bible Word Study. It does not, however, work correctly in the "Grammatical Relationships" section of Bible Word Study.
To reproduce:
1) Open pronunciation tool, enter "ζωὴ" in the search. Select Erasmian pronuncation from the dropdown and click the word to pronounce it.
2) Navigate to Matthew 25:45 in a Greek or reverse interlinear Bible. Right click on the word "Life" or "ζωὴν", go to "Lemma", and click "Pronounce". The result should be the same.
3) Choosing the lemma again in the right-click menu, this time open Bible Word Study. Click on the audio icon in the Lemma section at the top. Again, this result should be the same. Here comes the problem.
4) Enter the word "αἰώνιος" into the Bible Word Study. Scroll down to "Grammatical Relationships". "ζωὴ" should be the first word on the list. Click the audio icon. If you're having the same problem, you'll hear the modern pronunciation instead of Erasmian.
Cheers,
Mitch