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I'm not too sure if this is a bug or not, but here goes.
I have a new VPS running on Centos 5.
The install of CSF works flawlessly apart from one thing. When I click Check server security it runs through a few tests and then freezes at the PHP Check point.
Looking in the /usr/local/cpanel/logs/error_log file I see the following created each time I run the security check.
The error suggests that the process ran out of memory. That's probably either going to be the memory restriction in php.ini, or the memory restriction in WHM > Tweak Settings for cPanel processes, or more likely, there's insufficient available memory to the VPS.