The following error was obtained when attempting to save a mail folder.
Debugger entered--Lisp error: (vm-mime-error "(error \"Multibyte character in data for base64 encoding\")")
signal(vm-mime-error ("(error \"Multibyte character in data for base64 encoding\")"))
vm-mime-error("%S" (error "Multibyte character in data for base64 encoding"))
vm-mime-base64-encode-region(5 37 nil t)
vm-mime-B-encode-region(5 37)
vm-reencode-mime-encoded-words()
vm-with-string-as-temp-buffer(#("Re: “Victory at Bletchley Park Day” - Funding announcement" 4 34 (vm-coding windows-1252 vm-charset "windows-1252" vm-string t charset windows-1252) 34 36 (vm-coding windows-1252 vm-charset "windows-1252" vm-string t)) vm-reencode-mime-encoded-words)
vm-reencode-mime-encoded-words-in-string(#("Re: “Victory at Bletchley Park Day” - Funding announcement" 4 34 (vm-coding windows-1252 vm-charset "windows-1252" vm-string t charset windows-1252) 34 36 (vm-coding windows-1252 vm-charset "windows-1252" vm-string t)))
vm-mime-encode-words-in-cache-vector(["9820" "Tuesday" "29" "September" "2009" "23:40:06" "+0100" "Sue Black" "<email address hidden>" "<email address hidden>" nil #("Re: “Victory at Bletchley Park Day” - Funding announcement" 4 34 (vm-coding windows-1252 vm-charset "windows-1252" vm-string t charset windows-1252) 34 36 (vm-coding windows-1252 vm-charset "windows-1252" vm-string t)) nil nil nil "9" "2009092923:40:06" #("“Victory at Bletchley Park Day” - Funding announcement" 0 8 (charset windows-1252 vm-string t vm-charset "windows-1252" vm-coding windows-1252) 9 11 (charset windows-1252 vm-string t vm-charset "windows-1252" vm-coding windows-1252) 12 21 (charset windows-1252 vm-string t vm-charset "windows-1252" vm-coding windows-1252) 22 26 (charset windows-1252 vm-string t vm-charset "windows-1252" vm-coding windows-1252) 27 30 (charset windows-1252 vm-string t vm-charset "windows-1252" vm-coding windows-1252) 30 31 (vm-string t vm-charset "windows-1252" vm-coding windows-1252)) (number mark " 9/29 Sue Black 9820- " thread-indent #("Re: “Victory at Bletchley Park Day” - Funding announcement\n" 4 34 ... 34 36 ...)) "<email address hidden>" ("<email address hidden>" "<email address hidden>") nil t "356" "1273685120" nil])
vm-stuff-message-data([[#<marker at 1181855 in 2009-3> #<marker at 1181888 in 2009-3> nil #<marker at 1186582 in 2009-3> #<marker at 1186582 in 2009-3> #<marker at 1186583 in 2009-3>] ["345" "345" nil #<marker at 31711 in 2009-3 Summary> #<marker at 31820 in 2009-3 Summary> <<>> <-- From_ "4590" #<buffer 2009-3> 1 (<276d1e8d0909281711n507f1a89w260d591b8bc914f2@mail\.gmail\.com> <6C39F2A5-50F3-4BFD-8296-5A6F58FEE61E@dcs\.gla\.ac\.uk> <276d1e8d0909291540k5771a4cm93de04bd9968be49@mail\.gmail\.com>) nil nil nil nil nil nil #<overlay from 31711 to 31820 in 2009-3 Summary> imap nil] [nil nil nil nil nil nil nil nil nil] ["9820" "Tuesday" "29" "September" "2009" "23:40:06" "+0100" "Sue Black" "<email address hidden>" "<email address hidden>" nil #("Re: “Victory at Bletchley Park Day” - Funding announcement" 4 34 ... 34 36 ...) nil nil nil "9" "2009092923:40:06" #("“Victory at Bletchley Park Day” - Funding announcement" 0 8 ... 9 11 ... 12 21 ... 22 26 ... 27 30 ... 30 31 ...) (number mark " 9/29 Sue Black 9820- " thread-indent #("Re: “Victory at Bletchley Park Day” - Funding announcement\n" 4 34 ... 34 36 ...)) "<email address hidden>" ("<email address hidden>" "<email address hidden>") nil t "356" "1273685120" nil] [nil <v> t nil nil nil]])
vm-stuff-folder-data(nil)
vm-save-folder()
vm-quit(nil)
call-interactively(vm-quit nil nil)
Oh, well... It wasn't reproducible.