Dear all, when I run the following sample in XeLaTeX (TeX Live 2021)
\documentclass{beamer} \usetheme{Frankfurt} \begin{document} \begin{frame}{Test} \begin{block}{test block} \end{block} \end{frame} \end{document} it outputs the following warning messages: Missing character: There is no 4 ("34) in font nullfont! Missing character: There is no 1 ("31) in font nullfont! Missing character: There is no 0 ("30) in font nullfont! Missing character: There is no 4 ("34) in font nullfont! Missing character: There is no 4 ("34) in font nullfont! The output is not broken at all, I just find these warnings annoying. They do not appear with pdfLaTeX or LuaLaTeX, so I thought it was a XeTeX-related issue. I have already tried to replace \usetheme{Frankfurt} by the content of the Frankfurt theme file. There are the two lines \useoutertheme[subsection=false]{smoothbars} \useinnertheme[shadow=true]{rounded} If I comment both lines out, the warnings will all disappear, but then, the output is no more what I want. I've also found out that the number of warnings decreases by - commenting one of these two lines out, - removing the block, or - setting [shadow=false] in the \useinnertheme line But as I am not familiar with internals, I didn't dig deeper. Is this a known bug and where does it come from? XeTeX? Beamer? PGF? Thanks for your help, Michael