Hi, consider this file
---- start \documentclass{article} \def\abc{abc} \begin{document} $\abc$ \end{document} ---- stop With default engine (pdftex): Experience 1: name it as abcdefghi.tex. Switch to DVI mode. (C-cC-tC-p as PDF mode is ON by default) Ask to generate previews for all document. Answer YES to "Cache preamble?" It works. Experience 2: name it as abc def ghi.tex (so it includes spaces in filename) Switch to DVI mode Ask to generate previews for all document. Answer YES to "Cache preamble?" It **appears to work** but in fact it doesn't: .... Running `Preview-DviPNG' with ``dvipng -picky -noghostscript abc\ def\ ghi.dvi -o "abc\ def\ ghi.prv/tmp14749czs/prev%03d.png" -D186 '' This is dvipng (dvipng (TeX Live)) 1.15 Copyright 2002-2015 Jan-Ake Larsson [1 (preview-latex version 12.1) (preview-latex tightpage option detected, will use its bounding box) dvipng: Fatal error, cannot open output file abc\ def\ ghi.prv/tmp14749czs/prev001.png Preview-DviPNG exited abnormally with code 2 at Sat Jun 2 13:44:48 Running `Preview-DviPS' with ``dvips -Pwww abc\ def\ ghi.dvi -o abc\ def\ ghi.prv/tmp14749p9y/preview.ps'' ... So the preview was generated but using ghostscript as a fallback. In the case with no spaces the process output buffer contains this .... TeX Output exited as expected with code 1 at Sat Jun 2 13:50:37 Running `Preview-DviPNG' with ``dvipng -picky -noghostscript abcdefghi.dvi -o "abcdefghi.prv/tmp14749bHC/prev%03d.png" -D186 '' This is dvipng (dvipng (TeX Live)) 1.15 Copyright 2002-2015 Jan-Ake Larsson [1 (preview-latex version 12.1) (preview-latex tightpage option detected, will use its bounding box)] Preview-DviPNG finished at Sat Jun 2 13:50:37 .... This is with stock AUCTeX 12.1.1. Jean-François _______________________________________________ bug-auctex mailing list bug-auctex@gnu.org https://lists.gnu.org/mailman/listinfo/bug-auctex