I am using the texlive distribution on Ubuntu 14.04 and use the Texmaker IDE.
I implement latex using the quickstart function configured to
pdflatex -> bibtex -> pdflatex -> pdflatex -> View pdf
I have recently found that some of my documents start throwing up a lot of
"! Undefined control sequence.<argument> ..."
type errors. There is no reason for this to be occurring as far as I can see as I did not change anything significantly and it worked before.
I solved the problem simply by copy/pasting the code into a new file with a new name.
However I am curious why the errors occurred and how I can prevent this occurring in the future?