Update on this, I have checked a clean install of 10586 and cannot reproduce this with Start10 1.05
What language version of Windows 10 are you using and what settings do you have set for your taskbar and start button?
Is it set to autohide, is the search box set to be visible or a button? Any other settings in Start10 set?
Also can you open your Start10 installation folder and right click on Start10_64.dll pick properties and see what the signing date is please.