Photon Dashboard - Charts are empty

Hello,

I'm working with this Photon version:

== Core ==
PhotonSocketServer.2013
x64 Unicode Release
BuildDate: 2016-02-05 13:04:36
Version: 4.0.28.2962
SVN repository: photon-socketserver
SVN revisions of...
... this project: 2962
== SDK ==
BuildDate: 2016-02-08 15:37:16
Version: 4.0.29.11263
SVN repository: photon-socketserver-sdk
SVN revisions of...
... this project: 11263


And i'm trying to use old photon dashboard with these configuration.


I can see that my data are published because the PerfData folder is updated, but resulted graph are empty. Do you have any idea about this problem?

Graph example:


CounterPublisher log:


Thanks for your help.