OK, I found something that could help a lot of us using WMDC. I don't think this would help anyone using ActiveSync. Following these instructions allowed me to use the faster connection settings that stopped working many months ago.
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Keep your device connected
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From the desktop, go to Start > Start Search
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Enter "Device Manager" or "devmgmt.msc" to launch the Device Manager window
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Look under the "Network adapters" node for "Microsoft Windows Mobile Remote Adapter". If this is not present, skip to step 5. Otherwise, right-click "Microsoft Windows Mobile Remote Adapter" and choose to "Uninstall"
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Look under the "Mobile Devices" node for "Microsoft USB Sync". If this is not present, skip to step 6. Otherwise, right-click "Microsoft USB Sync" and choose to "Uninstall"
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Disconnect and reconnect your device set to "Enable faster data syncronization". Your device driver will re-install and Windows Mobile Device Center will launch."
What I think happened to me was that the driver for the slower type of connection was installed on my PC, once that happened it wouldn't make a faster connection. Deleting that driver and reconnection in the faster mode forced the PC to reinstall the faster driver. I found the information at:
http://www.microsoft.com/windowsmobi...eshooting.mspx