This appears to be a very poorly engineered update by Adobe, which they don't have a solution for it (I am assuming since they have not responded to your message.) It should not be enforcing a minimum length if the field is not required. But, luckily, their solution was so poorly engineered that you...

That makes sense. On our last AP campaign we were running it on the homepage and allowing all users into the test. That means a large percentage were "unknown" users so they would not have had values in these custom profile parameters. We may try to run this again but limit the audience to known use...

I have a question about Adobe Target Auto Personalization campaigns. Is there a way to specify which parameters the algorithm uses - or a way to weight some parameters? We have added custom profile parameters using info we know about the users past history on our site, but those custom profile value...