Error during gcc (nnimap)

[Niklas Morberg <niklas.morberg@axis.com>]

I Gcc messages to an IMAP-folder called "Sent Items". When
trying to forward several messages to several recipients I
got the following error:

Debugger entered--Lisp error: (error "Internal error, tag 9671 status BAD code nil text Protocol Error: \"Expected <LF> character not found\"")
  signal(error ("Internal error, tag 9671 status BAD code nil text Protocol Error: \"Expected <LF> character not found\""))
  error("Internal error, tag %s status %s code %s text %s" 9671 BAD nil "Protocol Error: \"Expected <LF> character not found\"")
  imap-parse-response()
  imap-arrival-filter(#<process imap> "9671 BAD Protocol Error: \"Expected <LF> character not found\"\r\n> BAD Protocol Error: \"Unidentifiable command specified\"\r\n>=20 BAD Protocol Error: \"No space following tag in IMAP command\"\r\n* BAD Protocol Error: \"Tag not found in command\"\r\n")
  accept-process-output(#<process imap> 1)
  imap-wait-for-tag(9671 nil)
  imap-send-command-wait(("APPEND \"" "Sent Items" "\" " #<buffer  *acc*>))
  imap-message-append("Sent Items" #<buffer  *acc*> nil nil " *nnimap* mailse01.axis.se")
  nnimap-request-accept-article("Sent Items" "mailse01.axis.se" t)
  gnus-request-accept-article("nnimap+mailse01.axis.se:Sent Items" (nnimap "mailse01.axis.se" (nnimap-stream ssl)) t t)
  gnus-inews-do-gcc()
  gnus-agent-possibly-do-gcc()
  run-hooks(message-sent-hook)
  message-send(nil)
  message-send-and-exit(nil)
* call-interactively(message-send-and-exit)

Is it just a temporary glitch or a real problem?

Niklas