Ah, so it doesn't seem specific to dgVoodoo's config. I had also noticed custom resolutions are being cleared in Radeon Settings whenever the second monitor is unplugged. The error I saw maybe suggests a problem with all resolution queries and possibly not only dgVoodoo. See below for error details …

I've been having an odd problem since one of my monitors in a dual set up stopped working. I've been using a single one for a bit now, but any games using the DirectX wrapper will not work. They throw errors related to DirectX or being unable to find a 3D adapter. The oddest thing I've noticed is, …