Hi Niels,
Thanks for your question! I searched through the forum for similar issues reported by users here in the Target community, and came across this helpful discussion on troubleshooting to avoid a redirect error.
In the meantime, I'd encourage you to discuss this issue with Customer Care during their session (Nov. 15th) on all things related to the Visual Experience Composer in Target - read more about this awesome resource (and REGISTER!) here!
Additionally, you might find this article on VEC Best Practices and Limitations helpful.
Warmly,
Amelia