I upgraded from 3.3.7 then after the upgrade Litespeed restarted and never go back. I used the command line to restart but it says started successfully but it just does not work.
I could not get the the admin panel so could not reverse back.
I just tried to upgrade from 3.3.7 to 3.3.8 on a Plesk VPS running CentOS and I experienced the same issue. On restart, Litespeed never came back and would not restart via the shell. I had to revert to 3.3.7 via command line in order to get Litespeed back.
Tried twice and got the same thing both times. Definitely an issue for at least this Centos+Plesk combo... 3.3.8 is not working...