ISPCONFIG 3.1 red bubble modifications not populated to all servers, even if modifications applied

Hello,
I'm using ISPconfig for a few years now and never had any problem.
My system is Debian Linux 8.7
I did an update to 3.1 las week, everything seemed to be working,
Yesterday making some changes in websites i noticed this blinking red bubble,
in which is listed all the changes that i made recently (yesterday).
It seems to me that the changes are made anyway (i created a mailbox before i post this thread, and it's working fine),
but they are still in the bubble and the jobqueue.
I made an update to the dev-stable version to ensure that there were no corrupted file, no luck, red bubble is still here
Thanks for any advice.

 

run /usr/local/ispconfig/server/server.sh and ensure that cron is running.

 

Thank you for the answer.
I've already done that, it told me that the process is already running with pid and a number.
Any other advice?