Yes, same to me. When I exit multiman to xmb, my PS3 shutdowns with 3 beep sound and a blinking red light.
I updated from 02.05 to 02.07 and then from 02.07 to 02.07.01. My CFW is 3.55 Waninkoko V2.
Sorry for my English, I'm from Spain.
Thank you so much and thank you for your great job.