Cannot switch templates

Hi. I have a Hot Start install of Multiplex. Its suck on the Gadget theme. I have deleted cache, tried different browser etc but it refuses to show the Bike theme. 

Hello,

To change the template, you should go to System > Site Template Styles. On this page, look for the Default column. Click the grey circle in the row where the Bike template is. It will become yellow indicating that the Bike template is now the default template.

Regards,
Milos

Yes this is the place where you change the default template.

But also make sure that you unassigned other templates. As you can see, you have certain templates assigned to certain pages.

It doesn't switch. Always on the tablet screen no matter which is selected.