[texhax] \input{file} adds an extraneous space

[jtzzaa11-texhax2 at yahoo.com]

After recently installing texlive , I've noticed that \input{file} adds an extraneous space, for example, if f.tex contains
abc

then
\input{f}test

produces 
abc test

Here is a minimal example:
\documentclass[10pt]{article}
\begin{document}
\input{f}test
\end{document}

Would appreciate suggestions how to solve this.

TIA,
Joel