Since last update the active field around PortableApps.com (just above the cross for leave) is much higher than necessary. So if you tab above in the grey field in order to show the launcher you get a new tab in your browser which is showing your website. Betwee "help"-button and "PortableApps.com"-button there is enough place for clicking to show the launcher.
Clicking on the PA.c logo is not a tab stop so you shouldn't be able to TAB to get there. How are you tabbing? Or did you mean tap?
Sometimes, the impossible can become possible, if you're awesome!