Indexing commentaries appears to crash MacSword

I have the MHC module (Matthew Henry's Commentary) installed. If I click on it to bring up the MHC window, then do Apple-F to find, and search for something, MacSword will display the "Indexing MHC" progress bar for a fraction of a second, and then it goes away as if it's done. At this point, MacSword hangs for a while.

And by a while, I mean at least 5 minutes.

Eventually it stops, and the "Find" button still reads "Stop" as if some kind of search is happening. But MacSword, as reported by Activity Monitor, is not using CPU. And if I click elsewhere in a MacSword window, I get the spinning beach ball, and finally I have to force quit MacSword.

Let me know if you need any more info.