If you type characters after hitting the space bar, do they appear ?
I fear it's the white space issue :
See issue 20878
. I discovered an interesting file (attachment 33679). I thought it was an OOo general setting but it's related to the paragraph style in fact. We can revert this behavior (at least for new paragraphs inserted before the first paragraph).
I googled a bit and I found 2 interesting pages :http://books.evc-cit.info/odbook/ch03.htmlhttp://blogs.sun.com/lars/category/Everything
The 'problem' comes from whitespaces with the xml attribute "text:c" for example <text:s text:c="484"/> in the issue attachment.
It seems that when a line is re-wrapped due to spaces added at the end of a paragraph, they're concatenated with this attribute. But if this value is too high, it's impossible to remove it and we don't see the spaces we type anymore, even if there is still much room on the line. I modified the value 484 in the content.xml of the issue attachment and I was able afterwards to type spaces at the end of the line (whereas it was impossible before) !
As ODF file (odt, ods, odp, ...) is a bunch of xml files zipped together, you can fix it easily: make a copy of your file, change the extension to 'zip' instead of 'odt', extract the file content.xml
and open it with your web browser (to see the structure more clearly). Search for the attribute 'text:c=' from the end of the file (problem may be for last paragraph I guess). When you've spotted the string, open the file also with a text editor (Notepad/Gedit), search from the end the string and replace the 'xx' number you've seen after this string with a small number like 1 or 2. Save the file, zip it back into the archive and change the archive extension back from 'zip' to 'odt'. Try to open it and add spaces.
AOO 4.1.2 on Xubuntu 15.10 (Wily Werewolf) and PortableApps port 4.1.2 on Windows 7