Mark -- The only processes I've tried with the new Dell were "Blink" and "ImageIntergration". Blink worked fine but during the integration process, it stopped after a few frames were processed and the attached error message popped up.
If I open the Edit tab/Global Preferences/File I/O settings and uncheck "use native file dialogs", everything works fine just as suggested in this thread. You do lose some of the nice search features that Windows has for the file explorer page when trying, for example, to select only the bias frames from a stack of other calibration frames so you could open just them in the ImageIntergration process.
Joe