Thanks Noel. It does work from the plugin browser. I don't normally use the plugin browser, and when I first tried your suggestion I was uncertain what you were talking about because I could not immediately see the folder for FX Chain. I have a fair amount of menus and the FX Chains is down at the bottom, so I had to scroll to even see that it was there.
This seems to be a bit inconsistent of functionality to me that drag and drop is not supported from the media browser. The media browser supports drag and drop of audio clips, midi clips, and track templates, why not FX Chain Presets?