I have this issue on my server. It happens sometimes when I refresh my webpages. It seems litespeed wont pass
file.php to php compiler and instead of rendering HTML and interpreting PHP, I will see my PHP source code. It won't happen always, only 2 or 3 times in 50 tries.
My PHP version is
5.3.10 but I had the same problem with
5.2.17 too. My Litespeed version is
CentOS 6 (x64)