\documentclass{beamer}
\usepackage[english]{babel}

\begin{document}
\setbeamercolor{background canvas}{bg=white}
\frame{Broken Version\\\includegraphics[width=\columnwidth,keepaspectratio]{vbox.pdf}}

\setbeamercolor{background canvas}{bg=}
\frame{OK Version\\\includegraphics[width=\columnwidth,keepaspectratio]{vbox.pdf}}
\end{document}
