Export Files window

Scriv 3.1.1, Mac OS 10.13.6.
Just encountered something odd, The Options area of the Export Files window is huge (and doesn’t appear to be resizable).

Looks like the first time I invoke File | Export | Files (either via menu command or keyboard shortcut) the window appears normal, subsequent times it appears as above.

Bah, I attempted to fix this and it works fine on 10.14 for me now, but I haven’t yet tested on 10.13. It is unfortunately an Apple bug - they changed the way accessory views are sized in save and open panels, and it has royally messed a lot of them up. I have added an extra height constraint in the hope that this will fix it on 10.13, and will test soon.

Thanks and all the best,
Keith