Cut-off say only calculate frequencys until this value (and the next higher value). If your spectrum input not change , then you get no other results.

And here the Help-Text from config-file :

"The default for this option is extracted, which means that CAESAR II will use the spectrum value at the last "extracted" mode. Changing this value to SPECTRUM instructs CAESAR II to use the last spectrum value as the ZPA for the missing mass computations."

I also dont no what the different is between use last extracted mode and use last spectrum value.
Its the different "extracted" means without missing mass calculation and "spectrum" with missing mass calculation ?