[AUCTeX] can't find file ??

[Benjamin Slade]

I'm stumped with what appears to be a fairly easy/straightforward
problem.  All of a sudden, when I try to compile LaTeX files in AUCTeX,
latex reports that it can't find the source (TeX) file.

Here's the output:

Running `LaTeX' on `.' with ``pdflatex  --synctex=1 -interaction=nonstopmode 
"\input" ..tex''
This is pdfTeX, Version 3.14159265-2.6-1.40.15 (TeX Live 2014/Arch Linux) 
(preloaded format=pdflatex)
 restricted \write18 enabled.
entering extended mode
LaTeX2e <2014/05/01>
Babel <3.9k> and hyphenation patterns for 79 languages loaded.
! I can't find file `..tex'.
<*> \input ..tex


Obviously somehow the input file name is being passed simply as ".",
which isn't a file and thus obviously the compiler can't find it. What
is perplexing me is that I haven't changed anything in my AUCTeX setup
and it was working fine before.  I did upgrade to Emacs 24.1 (but I
think, though I can't be sure, that it was compiling even after the
upgrade).

Where should I be looking to fix this problem?

-- 
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Dr Benjamin Slade
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(Choose Linux, Choose Freedom)