Mail app freezes with empty window

[danbaghilovici]

Prerequisites

• [X] I have searched open and closed issues for duplicates.

Describe the bug

After filling the data for adding a new account, Mail app freezes and its shows me an empty window with the data and inputs gone and with the buttons disabled (see images).

Starting the app from terminal doesn't provide any info:

dntzbgh@dan-crucial:~$ pantheon-mail 
Gtk-Message: 20:40:46.971: GtkDialog mapped without a transient parent. This is discouraged.
^C
dntzbgh@dan-crucial:~$ 

To Reproduce

Steps to reproduce the behavior:

1. Open Mail app.
2. Fill the data.
3. Click 'Add' button.

Expected behavior

It should open the mail list.

Screenshots or screen recordings

Logs

Platform Information

• [ ] I'm using the latest version from git that I've manually compiled
• [X] I'm using the latest released stable version (I'm using the version that comes pre installed)

  Additional context

[stsdc]

Can confirm.

[physaris]

I have same issue, run email client in debug mode, pantheon-mail -d and it says "GEARY_IMAP_CLIENT_SESSION_STATE_CONNECTING] Receive failed: Unable to deserialize from xxxxxxxx"