I'm having the same problem. I created a course last night and when I clicked to load it to my device, the system required me to upload some plug in. After I did that, none of my courses would load. I am now at work and can load the courses with no problem (haven't been prompted to install the plug in).
I have just uploaded the new version 3 plug in as requested and guess what, I cannot save create or view any of my courses. Looks like the new communicator plug in does not work....Garmin this is over to you to fix the bug in the software.
I am having trouble with this also. I get the same issue if I open my run today and click "save as a course." It worked fine yesterday with another I did, but it's been down for me all day today.
I haven't installed any new plugin between yesterday and today.