Known Issue: There are number of problems with Articulate Studio 13's Experience API support. As a result, it is not currently compatible with Wax LRS and many other Experience API tools. Presenter works sometimes after using the Storyline converter.
Solution: As soon as Articulate upgrades Studio 13 to be Experience API v1.0.0 compliant, this issue will be fully resolved. Articulate is aware of the issue and has not announced a solution or an estimated time frame for completion. Please contact Articulate Studio 13 Support for more information.