Due to bugs in Acrobat Reader, it is preferable to use the -dCompatibilityLevel=1.3 flag of ps2pdf (or use ps2pdf13). This requires the Acrobat >= 4 to read the file, but this is a reasonable requirement.
Index: configure.m4 =================================================================== RCS file: /usr/local/lyx/cvsroot/lyx-devel/lib/configure.m4,v retrieving revision 1.52 diff -u -p -r1.52 configure.m4 --- configure.m4 4 Sep 2002 11:56:44 -0000 1.52 +++ configure.m4 10 Oct 2002 18:45:55 -0000 @@ -260,7 +260,7 @@ SEARCH_PROG([for a LaTeX preview],LATEX_ # Search for a program to convert ps to pdf SEARCH_PROG([for a PS to PDF converter],ps_to_pdf_command,ps2pdf) -test $ps_to_pdf_command = "ps2pdf" && ps_to_pdf_command="ps2pdf \$\$i" +test $ps_to_pdf_command = "ps2pdf" && ps_to_pdf_command="ps2pdf +-dCompatibilityLevel=1.3 \$\$i" # Search for a program to convert dvi to ps SEARCH_PROG([for a DVI to PS converter],dvi_to_ps_command,dvips)