To reproduce:
- Open text comparison tool, and set it to show AFAT, and the Parallel Aligned Hebrew-Aramaic etc.…
- Set the comparison tool to show Genesis 1.
- Result: Nothing will display in the parallel aligned column.
- Now open a Bible.
- Move the Bible to another place in the OT, by typing in the Bible's reference box.
- Result: Text Comparison will move to the new location, but still won't display in the second column.
- Now move the Bible to another place using the scroll bars or mouse wheel.
- Result: Text Comparison works!
Like I said, weirdness (we'll leave aside the issue of the Parallel Aligned text not being usable for another discussion!).