bizare VC mode issue in emacs

[RJD]

This seems to be the most bizarre anomaly I have ever encountered. Here is
the scenario:

I am working. I make a change to a source file. I press `C-x v v` which
takes me to the *vc-log* buffer where I can enter a log message. In that
buffer I type something like this:

TICKET: 123
SUMMARY: implemented new function
REVIEWERS: richard.stallman

And then I press `C-c C-c` which then goes ahead and commits the message.
Now, when I view the log message the whole thing truncates to ONLY the first
line. It is as if there was a cutoff point at the first newline character. I
have even went into the /lisp/vc-*.el file to do some debugging to print to
the *Message* buffer the value of `comment` - which itself tells me is the
whole thing, i.e.:

TICKET: 123
SUMMARY: implemented new function
REVIEWERS: richard.stallman

But no matter what I do I only get the first line of the commit message.

HOWEVER, on an alternate machine (that is, I use two machines at work and
used to work on this older machine I am about to talk of) if I use the EXACT
same version of emacs `(GNU Emacs 24.3.1 (i386-mingw-nt6.1.7601)
 of 2013-03-17 on MARVIN)` I can check out the exact same repo in SVN, make
a change to the same file and do the process again. And - bang - it commits
and when I run an svn log --limit 1 - I get the entire commit message WITH
the newline characters.

In order to iron out any possible variables, I have ran emacs -q on both the
machines. I have ran a diff on all el/elc files in /lisp/ in both emacs
installation directories. I have verified the versions of emacs with `C-h
C-a`. I have also ensured the the SVN binary produces the same result with
svn --version: sure enough, on both systems they are exactly the same version.

Am I going mad?

** Windows 7 (unfortunately at work). The machine where I am only getting
one liners is a HP Z420, the other one is not. It is just a HP EliteDesk -
again, running the same operating system and same instruction-set processor etc.