i've had this problem (well not really a problem) for a long time.. i think ever since i updated to 3.1..
anyway i use the recording mixer v2, which came with my luna software (i don't think it's included with sfp 3.1) and occasionally, when i load sfp, it asks for the registry key for that mixer.. i have the "allkeys" file ready always.. but still this is becoming annoying.. why does it do that?