~suv asked about PDF 1.4 vs 1.5.
I've found exporting as PDF 1.5 is a problem if you produce files for other people to open using Adobe Acrobat.
I produced a PDF for a client in Inkscape 0.48 that they couldn't open with Adobe Acrobat. FoxPro could import it fine.
I used Inkscape 0.47 to export the same file as a PDF 1.4 on another computer and Adobe Acrobat had no problems understanding this pdf file at all.
~suv asked about PDF 1.4 vs 1.5.
I've found exporting as PDF 1.5 is a problem if you produce files for other people to open using Adobe Acrobat.
I produced a PDF for a client in Inkscape 0.48 that they couldn't open with Adobe Acrobat. FoxPro could import it fine.
I used Inkscape 0.47 to export the same file as a PDF 1.4 on another computer and Adobe Acrobat had no problems understanding this pdf file at all.