For some reason I cannot fathom, Word 2007 never jumped to the headers when I clicked them in my book documents. That means that when I opened the document map, and saw the headers I wrote, I could not click on them to navigate to them - which is a very useful function, and for some reason Word 2007 refused to do it for all documents for my book.
Word 2010 just installed, and solved this issue! now I can write more comfortably - thanks Microsoft!
Now for the fail...I installed Office x64 - in hope that it would work better on my Windows 2008r2 machine, utilizing whatever it needed from its 12GB RAM (ok, honestly - I don't actually need 64bit office. this version is meant for excel dark wizards who need more power when working on worksheets bigger than 2GB). However, I almost immediately regretted that choice, as now I cannot use the datasheet view in SharePoint (both 2007 and 2010). This technet article explains that this is because the 64bit version does not support the 32bit activeX that is used by the datasheet view:
"The Edit in Datasheet view functionality is not supported if you install 64-bit Office 2010. However, the functionality is available if you install 32-bit Office 2010. "
But...I am still curious to see how I go with 64bit office. so I will keep it on my 2008r2 server, and install the 32bit version on my windows 7 hyper-v machine (and take my screenshots of the datasheet view from there).
update (30 minutes later): it also appears that you cannot install SharePoint designer (since it is 32bit) on the same machine. lucky my win7 virtual machine is so snappy!