Problem finding multiple tags with same tagname

[Andrew Shepard]

I'm searching for tags in a TAGS file created by etags.  However, I'm 
unable to look for more than one tag with the same name when I follow
instructions given in the book "Learning GNU Emacs"

Here's an example where I'm looking for multiple instances of the 
function Play():

ESC-.
Play RETURN
(I am correctly taken to the first instance of the Play() function)

ESC-,

Message returned by Emacs is: 'No M-x tags-search or M-x 
tags-query-replace in progress'


Note that if I do a ESC-x tags-search on a tagname and follow with ESC-, 
emacs takes me to all the instances of the tagname.  It looks like the 
book I have might have an error in it.  However, if this is the case how 
do I find multiple instances of tags after using the ESC-. command?

Thanks in advance.

Andy ...