I have a dune buggy with a CVT trans that has this kind of problem quite frequently. In order to get it to work, I have to some times get out and roll the buggy a little, and that permits the CVT to engage into a direction. Luckily with the buggy, the middle position is neutral, as there is not park. This is one of the reasons why they should have just gone with a regular manual transmission, as ther are no issues, except for the people who don't have the smarts to learn how to drive a manual.