Show all instances not working

I have something very odd going on. For most of my fonts the preview works fine, but for one of them, it works fine if I select particular weights, or any weight, but if I select show all instances, nothing shows up.

This is what I see. If I select any, out a particular weight all fine…

On another font it works OK…

Does anyone have any bright ideas about why this is happening on just that one font?

Thanks in advance.

Just gone back to the last non-beta release and all fine. Odd that it happens on only one font and not the others. To that end. I have just gone back and tagged this thread with the bug tag. The version I had been using was the newest 3504.

That was reported in two other threads. I have fixed it. Update is on its way.

Sorry. Missed the other two. Thanks.

Update is out.

Perfect. Worked a treat. Thank you.