unable to create fastcgi PHP on Linux

I installed litespeed web server 3.0 enterprise trial on Debian Linux/i386 (not 64-bit). Everything seems to work, but I can't create FastCGI external app from the web interface (it's actually a PHP, this is well tuned and has all modules, so I don't want to recompile it to use LSAPI).

When I created FastCGI using web interface, it got saved. I clicked on it, I saw it with all entries empty and then it disappeared from the web interface completely.

I am using firefox 2.0.

Is this a known bug?