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When using the beamer documentclass, it looks like the third level of nested input is ignored:

\documentclass{beamer}
\input{body}
body.tex:
\begin{document}
\input{file1}
\input{file2}
\end{document}
file2.tex:
\input{file21}
The content of file21.tex is ignored with documentclass beamer, but correctly inserted if I use a documentclass article, for example.
Has anyone seen something like this?
                Works for me.  Can you post a minimal example, with a \listfiles in your preamble, and the output list of files?
– Alok Singhal
                Feb 17, 2010 at 1:55
Do you perhaps use the [ignorenonframetext] option ?
If so, \input is taken as nonframe text and ignored.
You can do \mode<all>{\input{file}} to force the input to work in the presentation mode.
You will need to start the included file with \mode* to start ignoring non frame text again.
        
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