Cannot add external account since migration ZCS 5->6

[mous]

Hi all,

First excuse me for my bad english

I have an issue, i cannot add an external account pop or imap.
the "testbox" never answer me ok nor failed.
I can see in mailbox.log that the test is successfull but the only choice I have is cancel button.

here the update i run for zcs : 5.0.9->5.0.11->6.0.1->6.0.2->6.0.4->6.0.5

Is there another log I can check for seeing why I have not a result in the testbox?