Hi 

I've installed 5.20 today. There seems to be a bug with "Timeline for
current buffer" (C-c aL)

Arithmetic range error: "floor", -0.0e+NaN

The Agenda buffer shows only one timestamped item. It's the same on
both my machines (with an identical org-file). I'm using GNUEmacs
23.0.50.1 on Debian Etch. 

Greetings

Sven