C-x C-w fails under VC

[Sebastian]

Something wrong with C-x C-w when under vc-mtn


Trying to write a file by useing
 C-x C-w
fails when under vc (vc-mtn actually)

starting emacs
C-x C-f ~/some/file/under/vc-mtn/iptables.sh
C-x C-w ~/some/file/under/vc-mtn/iptables-kassiopeya.sh

Message:

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  file-writable-p(nil)
  basic-save-buffer-2()
  basic-save-buffer-1()
  basic-save-buffer()
  save-buffer()
  write-file("~/develop/bash/iptables-kassiopeya.sh" t)
  call-interactively(write-file nil nil)


If I do
C-x C-w ~/some/file/under/vc-mtn/iptables-kassiopeya.sh

a second time I get either:

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  file-writable-p(nil)
  basic-save-buffer-2()
  basic-save-buffer-1()
  basic-save-buffer()
  save-buffer()
  write-file("~/develop/bash/iptables-kassiopeya.sh" t)
  call-interactively(write-file nil nil)

again, but the file is written.

Or, in some cases:

Wrote /home/sebastian/develop/bash/iptables-localhost.sh
vc-find-file-hook: Wrong type argument: stringp, nil


emacs is 23.0.60.2
file is under monotone (vc-mtn)


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