Eclipse - Kepler (3.4), Force.com IDE latest version (a/o 7/1/14) One project worked fine, another project was displaying errors & was unable to be upgraded. I deleted the project and went to create a new one, and am now getting the following error:
Unable to fetch organization details for 'firstname.lastname@example.org':
Invalid Api version specified on URL
To ignore this error and create an empty Force.com Project without connecting to the server, click Create Offline.
I've tried refreshing my security token, but I'm not seeing any change.