I notice people have been having an issue with cleven functioning so I decided to share a method that worked for me. As a result I manage to get the program to work. Bare in mind the only issue that I have is getting "Select Dictionary" to display "home/user/.cleven/dictionaries" when decrypting wpa/wpa2. Still I have been able to decrypt wep.

So to conclude. In my situation I had reflashed my n900 to the latest *rootfs* once I did that I installed the recommended components from the authors sight and ... bing-bang-POOF!!! it's working.

If you're scared to flash your device I understand. If not any you know what you are doing... go for it.

I must admit when flash I personally can't get eMMC to flash my device but if you can go for it.