1) configure your browser to be in normal cache mode
2) connect to a non configured app
3) the "incomplete conf" screen appears
4) configure the application
5) re-enter the orignal url you entered
6) the "incomplete conf" screen appears again !!!!!!! F5 allows to go on.

The problem comes from the redirection on server side (that should keep being the same) with a too strong cache value. Should be not cachable.