Just for reference, maybe somebody can find some use for this.
I installed Cacti, I added a few graphs, but I couldn't see the first page of graphs in the graph view. I could click on the graphs and I would see all graphs, just not the first page.
After searching for problems I found the following line in my
/var/log/apache2/error.log log file.
ERROR: I don't understand ':15:00 To 2011/03/09 10:15:00\c' \ in command: 'COMMENT:From 2011/03/09 09:15:00 To 2011/03/09 \ 10:15:00\c'.
This problem can be fixed by choosing the right version of RRDtool in your cacti Settings. So change Settings > RRDTool Utility Version to 'RRDTool 1.2.x'.
Now the graphs will be shown.