Effect is NOT reproducible with "LibreOffice 3.5.4.1 (RC1) German UI/Locale [Build-ID: 7306755-f4f605c-738527d-1cf4bc1-9930dc8] on German WIN7 Home Premium (64bit)

May be that is a missing Font / different font replacing problem? When I open the document in LibO everything looks very similar as in MS WORD viewer, but in your PDF (so it looks in LibO) for example text in text body looks like Arial (something sans serif), I see something similar to "Times New Roman". In reporter's PDF attachment "how the doc file looked in Word 2007" I see some "normal" looking Font contents in document properties, in "how the doc file looks in LibreOffice" I see a very strange reduced Font set.

Currently I can't see a LibO bug.

@junk_2010@live.co.uk
Please make sure that all required fonts are available on your PC, without correct font the comparison is inadmissible / useless.

I think that Rainer Bielefeld's suggestion is right. The original .doc file and the PDF file exported from Word 2007 use 'Calibri' for the page header, but the PDF exported from LibreOffice on Ubuntu uses 'DejaVu Sans' instead, probably because 'Calibri' is a Microsoft font which comes with newer Windows and Office versions but is not available on Ubuntu (correct me if I am wrong).

If I open the .doc file with LibreOffice on MacOS X, it looks fine as long as 'Calibri' is installed. If I change the font of the header manully to 'DejaVu Sans', it looks exactly like in the PDF exported on Ubuntu -- two lines, with a break before 'Format'.

I have re-opened the doc file in LibreOffice 3.5.3.2 in Ubuntu. When I place
my cursor in the header line the font in the menu font box is shown as
"Calibri", as it was in Word 2007. I had therefore assumed that the "Calibri"
font is installed.

The header text size is as Word 2007 (size 11), the font is also "unbold" as Word 2007. In case it was an issue like that in comment #2 in bug 50188.

Created attachment 62463 [details]
PDF showing document once Microsoft ClearType fonts installed

I have in Ubuntu 12.04 installed the Microsoft ClearType fonts, ie Calibri and Cambria.

Now the header text is only on one line, as it was in Word 2007. So the header text being on 2 lines is a font issue as suggested, thank-you for the feedback. This was with LibreOffice 3.5.3.2.

A pdf showing the result is attachment 62463 [details].

However, I do still believe there is an issue here. In both cases, with and without the Microsoft ClearType fonts installed, as a user in LibreOffice I could see no difference in the information about the header text. ie in both cases the text was listed as "Calibri" in the font box. Even though in one case, when the header text was on two lines, it was not.

I presume a font substitution has occurred in the "incorrect" two header line case, but this was not obvious to me as a user. I believe it should be. At least then I would not think it was an issue with LibreOffice, and I would be pointed in the direction of the real "missing font" issue.

@junk_2010@live.co.uk 
I agree, it's difficult to fine out whether shown font type really is available on PC or only has been selected by author, but is replaced for VIEWING on different PC

http://cgit.freedesktop.org/libreoffice/core/commit/?id=0376a4c13ccffa64c938c6361a337264ad8f2b67
http://cgit.freedesktop.org/libreoffice/core/commit/?id=17d86df23e7be3ab0a161f69ff0f703728e0e135

Is this the solution to the bug?

Samual M. said in comment 6:
Is this the solution to the bug?

I believe it is.

One further thing that might be nice is if the "combo tool tip" message talked about in:
http://cgit.freedesktop.org/libreoffice/core/commit/?id=17d86df23e7be3ab0a161f69ff0f703728e0e135
also said what font it had used as a substitute.

Luboš, would you have a look at Comment #8?

As said in previous comments, the UI now has a way to show this, so closing.

As for actually naming the font used, that's done in a completely unrelated code (and since the 'Character' dialog doesn't show the information either, it's a question how difficult it would be to find out). If you want such a feature, a suggest a separate enhancement request.

I have filed bug 61134 for the enhancement suggestion "When A Substitute Font is Being Used In The Font Combo Tooltip Say Which Substitute Font is Being Used"