i am not seeing this issue.
have been tweaking a book which has lots of  : - sigil tells me there are 480 of them
many are used as line spacers i.e. like <p class="something"> </p>
the book opens & closes in sigil just fine, no issue with links, no issues with "lost" spaces
I reckon I started this book tweak at least one version back - maybe 2 versions back.
I am using the 64bit versions.
I just re-opened a different recent book & that still has 43 NBSP intact??
these are books that have also been run thru calibre, because if I fix up chapter breaks I then use a calibre epub-to-epub conversion to split the xhtml files on a one-per-chapter basis - as that is faster than doing them manually.
either the bug is being badly described or the 64 bit versions are immune ?
Last edited by cybmole; 12-14-2012 at 01:30 PM.