I've used it for over a year, maybe two but on and off till a year ago.
As said I've ran all the 4.1 RC's in production env, doing about 30million hits a day or more.
and I just switched to 4.1.1 - as people suggest do a force reinstall. You can just run litespeed on port 8080 or whatever fancy's you and test yourself instead of killing your traffic. Honestly though if that hurts you enough I'd look into HA and multiple web frontends.