GMail's IMAP stopped working for me

[Jonas Hörsch]

Hej,

for some days now i'm getting strange errors trying to sync my GMail
account 

ERROR: Aborting sync, folder 'GMail.INBOX' [acc: 'GMail']
  Error SELECTing mailbox 'INBOX', server reply:
('NO', ['System error (Failure)'])

but it doesn't seem to be offlineimap's fault, as an ipython session
gives me:

In [1]: import imaplib

In [2]: im = imaplib.IMAP4_SSL("imap.gmail.com")

In [3]: im.login("changed", "omitted")
Out[3]: ('OK', ['changed at gmail.com Whoever authenticated (Success)'])

In [4]: im.list()
Out[4]: 
('OK',
 ['(\\HasNoChildren) "/" "INBOX"',
  ...
 ])

In [5]: im.select("INBOX")
Out[5]: ('NO', ['System error (Failure)'])


does this only hit me? can anyone confirm, that there is a problem on
google's end?

thanks,
jonas