Parallels does not remember my multi-monitor settings

My problem is as follows:

1. I am using a 15" MBP with Retina
2. I am using a standard external monitor (native resolution 1920x1200)
3. I am able to configure everything as I like it:
- My Windows desktop is extended across both screens
- The resolution of both screens is set to 2800x1800 in Windows
- Parallels sets my DPI to 200% and everything looks great
4. Things go wrong when I unplug my external monitor to take my laptop to a meeting, and then go to plug it back in later. When I plug the external monitor back in, it will default to a non ideal resolution - either 3840x2400 or 1024x768, depending on which of the full screen scaling options I specified. I have tried all four settings and none of them will remember the resolution I set for the external monitor when I plug it back in.

This is very similar to the problem discussed in this thread however the provided answer in that thread does not work for me.

It would be really great if there was a config setting I could specify somewhere which just lets me explicitly set the resolution I want each Windows screen to run in, and that this setting was always used instead of some attempt to magically pick the right resolution.

 

Have you tried clearing the PRAM (hold command-option-p-r on boot until you hear the chime at least twice)? This will clear out all settings. Then, once you reset the resolution, it should stick even after unplugging and replugging the monitor.

Steve