[Evolution] IMAP Folders disappear

[Andrea Vai <andrea vai unipv it>]

Hi all,
I am experiencing a problem, since this morning, when I opened Evo after 10 days of inactivity.
After some minutes, suddenly the main folder of my IMAP account disappears. There are also several subfolders 
in there, which I am subscribed to, and they also disappear. (With "main folder" I mean the folder named 
"[Gmail]" in my GMail IMAP account).
The problem seems to be unrelated to any event I am aware of.
The problem is reproducible, i.e. it happens every time I launch evolution (closing and restarting evo makes 
the folders visible again, until it happens again).
I have tried to investigate the problem by myself (searching on google and in the list archives, with no 
luck), and

CAMEL_DEBUG=all evolution 2>&1

gives me, after the problem happens:

===========
DB SQL operation [BEGIN] started
Camel SQL Exec:
BEGIN
Camel SQL Exec:
CREATE TABLE IF NOT EXISTS Deletes (id INTEGER primary key AUTOINCREMENT not null, uid TEXT, time TEXT, 
mailbox TEXT)
Camel SQL Exec:
INSERT OR REPLACE INTO Deletes (uid, mailbox, time) SELECT uid, '[Gmail]', strftime("%s", 'now') FROM 
'[Gmail]'
Error in SQL EXEC statement: INSERT OR REPLACE INTO Deletes (uid, mailbox, time) SELECT uid, '[Gmail]', 
strftime("%s", 'now') FROM '[Gmail]' [no such table: [Gmail]].
Camel SQL Exec:
DELETE FROM folders WHERE folder_name = '[Gmail]'
Camel SQL Exec:
DROP TABLE '[Gmail]' 
Error in SQL EXEC statement: DROP TABLE '[Gmail]'  [no such table: [Gmail]].
Camel SQL Exec:
DROP TABLE '[Gmail]_bodystructure' 
Error in SQL EXEC statement: DROP TABLE '[Gmail]_bodystructure'  [no such table: [Gmail]_bodystructure].
Camel SQL Exec:
COMMIT
DB Operation ended. Time Taken : 0,000118
###########

Don't know if it matters, but that "no such table" message seems to be related to the problem.

Can anyone help me please?

Thank you very much,
Andrea

Evolution v. 3.12.11