Broken file list in open/save dialogs?

Damien Garwood <damien@...>

For some reason, I'm struggling to access the files and folders list of a standard open/save dialog. Even more strangely, it's only in one program. This has only started happening today, since I updated Windows 10 from 1809 to 1909.
When I try to access the list, all I get from NVDA is: "Items view list". Any attempt to move up and down the list results in silence, and any attempt to move back to parent directories results in a repeat of "items view list".
Has anyone got any ideas as to why this might be happening, or how to fix it?

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