uknown error when uploading GPX files to Basecamp

Hi  -

Would anybody know a fix to an issue I have uploading some GPX files to Garmin BaseCamp?  It displays an unknown error.  I've tried restarting BaseCamp, re-downloading the GPX files, etc.  Won't work.

I can load the same GPX files into my Oregon 600 and they look fine.  I therefore rule out that they are corrupted.  I just cannot get them into BaseCamp.

Thanks!