Created attachment 97465 [details]
Screenshots showing the effect of the described bug.
I have an "Illustration Index" in one of the bigger documents I created with LO. After upgrading to LO 4.2.x the chapter reference in this index changes to ?? when I'm updating the index. Doing the same with a 4.0.x or 4.1.x version works OK. I've checked the bug with 4.2.2 release and 4.2.3 release on a 64bit Win7 and a 32bit WinXP - same behaviour. A "User-Defined Index" inserted for testing shows the same behaviour. I attach a screen-shot which shows my index before and after an update with LO 4.2.x.
In fact, the bug seems to be somehow related to  - it is about chapter cross-reference and the result is ??. In addition, if I add a "User-Defined Index" to the sample doc from , it shows the same ?? as chapter references. Probably it is duplicate but I'm not sure - therefore I file it separately.
As this bug renders any index with chapter reference useless, I would like to have this bug a higher priority than the <medium>/<normal> in  - especially as it was newly introduced in 4.2.x and worked OK with 4.1.x and older (didn't check 3.x releases, though).
Thanks for your research and feedback.
I read your comment on bug 75519 (you can reproduce that bug), but is it possible to attach a small portion of your document, which still reproduce the behavior. Feel free to sensor the content first (hint: search and replace can change some characters in batch to 'x' or something like that).
thanks for your reply. Yes, I can shrink my document a bit still reproducing the bug. The content is not a secret - its a published manual anyway.
I attach this version in which I threw out a lot of text but keeping the chapter structure and a few figures per chapter (1..3). I didn't updated neither the contents index nor the figures index - that's why the indexes are looking ok when you open the document. If you do an update of the figures index (at the end of the document) with a 4.2.x release, you'll get the ?? instead of chapter numbers. If you do the same with the contents index, the chapter numbers are ok.
I hope that's the kind of document you have asked for - if not feel free to contact me again. It's really crucial for to get this bug fixed as it renders my document useless - that means that I have to stick with LO 4.1.x until it gets fixed.
Best regards, Christian
Created attachment 97742 [details]
reduced version of the manual where I noticed the bug first
Just to reconfirm - 4.2.4rc1 still has this problem.
Thanks for your extra information!
Reproducible, tested using windows 8.1 using LibreOffice Version: 220.127.116.11.alpha1+
Build ID: 0b03f7ed575838f90e6b1ebec3538a3a214f81fb
TinderBox: Win-x86@39, Branch:master, Time: 2014-04-30_01:30:46
* Open attached test document
* scroll to one of the last pages of the document
* Right click > update Index/table
Thanks Joren for confirming. Does anybody work on that item? I just tested 4.2.4rc2 and it still has the problem.
Kind regards, Christian
*** This bug has been marked as a duplicate of bug 75519 ***