I also have / had this problem with several UPi CRM Versions.
I solved the problem always by changing in the file upicrm.php line 29 from “@session_start();” into “//@session_start();”.
For my website this workaround works, the site health warning disapppeared and the UPi CRM plugin ist still working without any problems.
The “session_start” problem appeared in UPi CRM version 2.3.8.1 again, after ist was solved in version 2.3.8.0.
I hope this will help to fix the bug for all upcoming versions.
