1. I tested it in several 5.x (5.3 5.4.2 and 5.5 alpha)
2. 3.30.2
I see... I knew I add to have both Standard and dynamic login on the "login.apx" page... or DNN would show an error!
But form what you say I now see that I must have it in all pages I have Dynamic Login... I have it in every page actually... or at least the ones shown to the "unauthenticated users".
Still what you say does not work, in the site I'm testing now, wish is using 5.5alpha (I was forced to do the upgrade because of some ajax and mail problems in 5.4.4, that would cause DR to fail)!
So I'll forget about the tests on other version... lets say the scenario is 5.5 alpha and I have 1 DR form on "Register Page", and another on "User Page".
So in Admin -> Ste settings I have TWO settings not one...
"Registration page: register"
"User Page: userProfile"
I believe Dynamic Login token redirects to "UserProfile" page because before 5.3 we only had one setting here -> "user/register page" like you said...
I believe this is the reason it fails since 5.3 and not because you need to have both login modules!
Do you have any DNN 5.3 or 5.4 "beta test site" where this could be tested?