Also black bullets for second level itemize.

beamerthemelumc.sty

@@ -55,6 +55,7 @@
 % Change the bullets in the itemize environment.
 \setbeamertemplate{itemize items}[circle]
 \setbeamercolor{itemize item}{fg=black}
+\setbeamercolor{itemize subitem}{fg=black}
 \newcommand{\fakeitem}{\,\ \ \ $\bullet$\ \,}
 
 % Captions also in black.