Can't change patch for instrument playback

When I try to change the patch for an instrument (or assign one where there is none), Dorico does this fairly regularly:

I click on the row in Halion Sonic and the click is registered on the next row. But clicking on the previous row doesn’t open the interface either. Any ideas?

This is something that I’ve seen from time to time though never in a reproducible way. It seems the position of the plugin ui is offset slightly. I think you can fix this just by causing the plugin to redraw. Try clicking the title bar of the window.

Oh! This is genius! Clicking on the title bar fixes it. Thank you.