Thesis 1.8 (current version is 1.8.2) introduced a great, easy header image uploader. No more messing with code to get a custom image for your website banner.
Unfortunately for some folks, switching to this method rendered their header image not-clickable. I had a hell of a time figuring out how to make it clickable again.
Turns out it’s really easy :)
First, remove any custom code for your header image from custom.css and custom_functions.php so you don’t have to worry about conflicting information.
Second, upload your header image via the header image uploader.
Third, make sure “show site name in header” is selected in Thesis > Design Options.
That’s it! You have a clickable header!