Ganglia-web login not working

[stepchi]

We have Ganglia Web Frontend version 3.6.1 and Ganglia Web Backend (gmetad) version 3.6.0 working on Ubuntu 18.04 with Apache/2.4.29 (Ubuntu) with Basic Authentication configured and entries in config.php to setup the the ADMIN "role" to allow creation of new views. This has been working fine for about a year. We recently installed Ganglia Web Frontend version 3.7.4 and Ganglia Web Backend (gmetad) version 3.7.2 on a server with CentOS7.9 with Apache/2.4.6 (CentOS) with the same configuration in ganglia.conf and config.php but login is not working. When I click on login on the main Ganglia web screen and enter my username and password it appears to accept it and closes the popup window and appears to refresh the screen but it still shows "You are not currently logged in" in the upper right corner of the screen. Any attempt to create a new view gives the expected error "You do not have access to edit views". However, after attempting the login I notice in the access_log after my login attempt that the header of the messages now show the username that I attempted to login with... mylaptop.company.com - usergang [07/Oct/2021:11:11:09 -0400] "GET /ganglia/stacked.php?m=load_one&c= I'm hoping someone might have some insight as to what the issue could be.
Thanks,
Steve C.