Display not detected in Windows 7

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Hi everybody. I'm hoping somebody can help me get Displaylink to detect my monitor. I have a Dell XPS L521X running Windows 7 Home Premium with a Dynadock docking station connected to a Viewsonic monitor. It worked fine for several years, until last week. Windows Update tried to update my Displaylink software, but the installation failed, then the docking station stopped working completely. Reinstalling the software was unexpectedly difficult because of compatibility problems with the USB drivers (which had never been an issue before), but after many uninstallations and reinstallations of various versions of multiple drivers, I finally got it mostly working. Audio and USB ports on the docking station are fine now, but it won't detect the display. I've followed the troubleshooting instructions as best I can, but no luck. This is driving me nuts.

I'm attaching the log file. If anybody has any suggestions, I'd be most grateful. Thank you.