Uwe Stöhr wrote: > Why is \includeonly no longer working? (I missed that thread.)
Because we use mangled filenames in the tmp dir if we process multiple files (in order to prevent file name clashes). If you put \includeonly{child1} in your preamble, LaTeX won't find it, because the tex file will be named something like 1_home_uwe_child1.tex This is the case since LyX 1.3 or so. Jürgen