The content margins for the bottom bar of the start panel are not set properly or the skin design forces the text and buttons to be shortened because of the skin settings. Any skin in which the bottom of the start panel is not the normal length, you will get this problem. Non- english systems will have problems sometimes as well because more letters are used.
I try to design my skins to accomodate the third button but sometimes a skinner has to trade function away for a radical design.

You must be trying to use the compact start panel of the adrenaline skin. You will get that problem with ALL compact versions of skins. Switch to the normal start panel and you should be all set.

Content margins for the logoff pane.