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For me this change wasn't enough.
After the use of an overlay, still \label wouldn't work.

--- prosper.cls.orig Fri Dec 7 16:12:47 2001
+++ prosper.cls Fri Dec 7 16:18:56 2001
@@ -584,7 +584,7 @@
\InOverlaysfalse
\long\def\overlays#1#2{%
\global\InOverlaystrue
- \aftergroup\InOverlaysfalse
+ \aftergroup\global\InOverlaysfalse
\setcounter{limitOverlays}{#1}
\setcounter{overlaysCount}{1}
\ifDVItoPS
@@ -615,6 +615,8 @@
\else
\Label{#1}
\fi
+ \else
+ \Label{#1}
\fi
}
% For amsmath environments