Suddenly I am getting the cryptic "Text line contains an invalid character" errors (100 of them) on all my beamer files. Even this MWE doesn't work right:
\documentclass{beamer}
\begin{document}
Sample document.
\end{document}
I am using the latest TeXnicCenter (2.02 stable) and Miktex 2.9 - what has gone wrong?
My feeling is that something is screwed up with the encodings but I can't figure out what.
UPDATE: Texmaker doesn't work either, giving this error: "A funny symbol that I can't read has just been input."