Comodo doesn't log alerts


I’ve Comodo version and I have the following problem :
Under Miscellaneous tab, Settings, Logging I have checked “If the log file’s size exceeds 10 MB” move it to comodo folder. Disable Defense+logging is unchecked.

I have Defense+ alerts and when I look at the “View defense+ Alerts”, the list is empty even if I check “More” and “All the times”.

Can someone tell me why ?