Tested it with latest develop branch (from both self made RPM or with a git install / with and without passenger):

On the client the changes are applied:
[root@myserver01 puppet]# puppetd --server puppet.test.mydomain.local --test

info: Loading facts in lwsite
info: Loading facts in lwopenversion
info: Loading facts in lwsite
info: Loading facts in lwopenversion
info: Caching catalog for myserver01.test.mydomain.local
info: Applying configuration version '1300444752'
notice: /Stage[main]/Ntp::Config/File[/etc/ntp.conf]/ensure: defined content as '{md5}7983c9a394663b29d51178539dbdf2e5'
info: /Stage[main]/Ntp::Config/File[/etc/ntp.conf]: Scheduling refresh of Service[ntpd]
notice: /Stage[main]/Ntp::Service/Service[ntpd]: Triggered 'refresh' from 1 events
notice: Finished catalog run in 0.71 seconds

On the server log:

[2011-03-18 14:12:10] INFO  WEBrick 1.3.1
[2011-03-18 14:12:10] INFO  ruby 1.8.5 (2006-08-25) [x86_64-linux]
[2011-03-18 14:12:10] INFO  WEBrick::HTTPServer#start: pid=32193 port=3000

(...)

Processing HostsController#externalNodes to yml (for 192.168.35.36 at 2011-03-18 13:42:23) [GET]
  Parameters: {"name"=>"myserver01.test.mydomain.local", "format"=>"yml", "action"=>"externalNodes", "controller"=>"hosts"}
Completed in 16ms (View: 0, DB: 6) | 200 OK [http://foreman.test.mydomain.local/node/myserver01.test.mydomain.local?format=yml]

Processing ReportsController#create to yml (for 192.168.35.36 at 2011-03-18 13:42:24) [POST]
  Parameters: {"format"=>"yml", "action"=>"create", "controller"=>"reports", "report"=>"[FILTERED]"}
processing report for myserver01.test.mydomain.local
Completed in 77ms (View: 1, DB: 20) | 200 OK [http://foreman.test.mydomain.local/reports/create?format=yml]

On the web interface:

    All Reports
myserver01  "True(green)/less than a minute ago/Applied:0/Restart:0/Failed:0.../Config Retrieval:0.49 / Runtime:0.55" 

When I click on "details" of this specific report you can see the changes:

myserver01.test.mydomain.local

Reported at Fri Mar 18 13:42:22 +0100 2011, which is 1 minute ago
        Puppet Output 
Level     Resource                                 message 
info //myserver01.test.mydomain.local/Puppet Loading facts in lwsite 
info //myserver01.test.mydomain.local/Puppet Loading facts in lwopenversion 
info //myserver01.test.mydomain.local/Puppet Loading facts in lwsite 
info //myserver01.test.mydomain.local/Puppet Loading facts in lwopenversion 
info //myserver01.test.mydomain.local/Puppet Caching catalog for myserver01.test.mydomain.local 
info //myserver01.test.mydomain.local/Puppet Applying configuration version '1300444752' 
notice //myserver01.test.mydomain.local//Stage[main]/Ntp::Config/File[/etc/ntp.conf]/ensure defined content as '{md5}7983c9a394663b29d51178539dbdf2e5' 
info //myserver01.test.mydomain.local//Stage[main]/Ntp::Config/File[/etc/ntp.conf] Scheduling refresh of Service[ntpd] 
notice //myserver01.test.mydomain.local//Stage[main]/Ntp::Service/Service[ntpd] Triggered 'refresh' from 1 events 

Clinking on the "host" on the web interface, it keeps saying on the right side: "No puppet activity for this host in the last 7 days", and sometimes it stops showing the dynamic graphs on the left side. :(
If I delete and readd the host, the graphic shows up again (empty of course)

Gems installed on the server:
> gem list

*** LOCAL GEMS ***

fastthread (1.0.7)
json (1.4.3)
mime-types (1.16)
mysql (2.7)
passenger (2.2.15)
rack (1.0.1)
rake (0.8.7)
rest-client (1.6.1)
sqlite3-ruby (1.2.4)

puppet RPMS:

puppet-2.6.6-0.3.el5
puppet-server-2.6.6-0.3.el5

NOTE: The "stored" report under "/var/lib/puppet/reports/myserver01.test.mydomain.local" you can see in attach.

I've tried reinstalling it again but it didn't help.
Am I doing something wrong ?