Re: decode-coding-string gone awry?

[Richard Stallman]

    Yuk.  The problem is that this buffer is not only processed by
    preview-latex, but also by AUCTeX, and the versions that get combined
    may be different.  AUCTeX uses the source code buffer's file encoding
    by default, which is fine for basically unibyte based coding systems.

It sounds like the safest thing is to convert the string to what you
want, just before you use it.

    If decode-coding-string is supposed to have a chance of reassembling
    this junk, it must only be run at the end of reconstructing the byte
    stream.  Yes, this is completely insane.  No, I can't avoid having to
    deal with it somehow.

If you reconstruct the correct byte stream, it should work to apply
decode-coding-string to it.