[Evolution] spool directory always none

[luigi <laporta enea it>]

Hi all,

I use Evolution version 3.12.11 in a Scientific Linux release 7.2
(Nitrogen). Since a few weeks, I'm not able to change the preference of
any mail account. In particular, 
1) I can not setting the file spool mbox: when I select a spool file
in /var/spool/mail/xxxx it is alwaye setting to "none" and I obtain the
following messages:  evolution-mail-WARNING **:
receive_update_got_folderinfo:  Store root (null) is not an absolute
path.
2) I can not leave messages on the mail server. When I check this
option , it is always uncheck.

I have uninstall and reinstall evolution, but the problem remains.

Luigi