When you setup the profit-switching Managed Miner, what profit-switching profile did you select?  And on that profit-switching profile, did you put in your hashrate for the Skein algorithm?

There's a built in nVidia profit-switching profile, you should edit that profile and input any known hashrates your card can do.  I'm assuming you are using an nVidia card since you are mining Skein.  There's also a built-in AMD GPU profile.  You can either put in your real-world hashrates, or for simplicity's sake I use whattomine's generic rates for a specific card