diff --git a/ahilbig-common.sty b/ahilbig-common.sty
index 578c3f2..bb206b0 100644
--- a/ahilbig-common.sty
+++ b/ahilbig-common.sty
@@ -92,6 +92,7 @@
 %%% Für Formeln %%%
 \newrefformat{form}{Formel~\ref{#1}}
 %%% Für Aufgaben %%%
+\newcommand{\refexercise}[1]{} % siehe weiter unten Definition
 \newrefformat{ex}{\refexercise{#1}}
 
 
@@ -827,7 +828,7 @@
   \par\medskip
 }
 
-\newcommand\refexercise[1]{\insertexercisetext~\ref{#1}}
+\renewcommand\refexercise[1]{\insertexercisetext~\ref{#1}}
 
 \mode
 <all>
diff --git a/ahilbig-script.sty b/ahilbig-script.sty
index 0682fcc..635c753 100644
--- a/ahilbig-script.sty
+++ b/ahilbig-script.sty
@@ -1446,6 +1446,7 @@
 
 \newenvironment{lecture exercises}
 {
+	\clearpage
   \ifddiwideexercises
     \begin{wide pages}\twocolumn[]
     \fi