[Observium] Alerting configuration problem

Hi,

I am starting with observium Professional Edition (i first installed community edition and upgraded it to pro with svn) and try to run the alerts. I have enabled email alertsin configuration.

Nevertheless, when I create "alert checkers" (here a simple example with storage check), after clicking "Regenerate" this list me well the devices / entities corresponding with the check but when I look at the details of a check, I don't find anything in the list below. See screenshots for details.

I had a look at my mysql database and tables "alerts", "alert_table" are empty (i don't know if it's normal).

Can someone help me please ? I don't know what to check.

B.R.