There is a known issue with the current version of VEXcode that causes it to not see the current version on the server. This seems to mostly be on mac/Windows installed apps and in the browser version of VEXcode.
We are working on a fix for this. Until that is ready and released, the best work around is to use the web version (codeiq.vex.com) if you have never used it before. If you have used the web version before, then use either a new browser or an incognito window to access the site. This will usually cause the cached data that is causing the issue to be pulled directly from the server.