Bueno, remirando un poco, en el FAQ del programa pone....:
I'm using a Galaxy S2 and the Home button unlocks WidgetLocker
The Samsung Galaxy S2 behaves different than other devices. I'm looking into a better fix for the Home button on this device, but in the mean time as a work around you can:
Enable Settings > Advanced > HomeHelper:
HomeHelper Component
HomeHelper Block Home
Then hit Select System Home > WL HomeHelper
Vamos, que dice que sabe que hay un problema en el galaxy, y que de momento hagamos eso que expone, que lo arreglara...