Hello Thomas,

I ran into exactly that question this morning and managed to figure it out.

If I use "emacs -q" then C-c & works as expected and is mapped to (org-mark-ring-goto & optional N).  However when trying C-c & C-h I find out that C-c & is a prefix for a few yasnippet commands:

,----
| `yas/minor-mode' Minor Mode Bindings Starting With C-c &:
| key binding
| --- -------
|
| C-c & C-f yas/find-snippets
| C-c & C-n yas/new-snippet
| C-c & C-s yas/insert-snippet
| C-c & C-v yas/visit-snippet-file
`----

Seems this is another place where yas and org don't get along well together

On Wed, Feb 29, 2012 at 11:09, Thomas S. Dye <tsd@tsdye.com> wrote:
> Andreas Leha <andreas.leha@med.uni-goettingen.de> writes:
>
>> tsd@tsdye.com (Thomas S. Dye) writes:
>>
>>> Andreas Leha <andreas.leha@med.uni-goettingen.de> writes:
>>>
>>>> Hi all,
>>>>
>>>> attached is a patch that enhances org-babel-goto-named-src-block (bound
>>>> to C-c C-v g by default).  Included are two enhancements:
>>>>
>>>>  1. the point is pushed to the org-mark-ring, such that returning with
>>>>     C-c & becomes possible
>>>>  2. the target src block is guessed from
>>>>      a) noweb-reference
>>>>      b) #+call:
>>>>      c) #+results:
>>>>      d) symbol-at-point
>>>>     if one of these is found (in that order)
>>>>
>>>> - Andreas
>>>>
>>>>
>>> Hi all,
>>>
>>> Should C-c & be included in Key Bindings and Useful Functions, Section
>>> 14.11 of the Org Mode manual?  Or, is this a general Emacs thing
>>> documented elsewhere?
>>>
>>> Tom
>>
>> In my opinion, it would be nice to have this listed in the Org Mode
>> manual.
>>
>> - Andreas
>>
>>
>>
> Hi Andreas,
>
> Is C-c & correct here?  On my system I can jump back following the
> instructions:
> Position saved to mark ring, go back with M-x org-mark-ring-goto.
>
> But C-c & waits for more input.
>
> Tom
> --
> Thomas S. Dye
> http://www.tsdye.com
>