Conflict with admin.module: Submit button not usable

This is a great theme, thanks for that. Just ran into a smal problem and I couldn't figure out yet, what the problem is.

When you also use the admin.module you get a theme switcher which lists all available themes as radios and a submit button to save the current selection. Now, that button is just grey, the text of the button not visible and the button not clickable.

However, the button in the page for e.g. the contact form works just fine.

Attached is a screenshot that shows both buttons, one usable the other one not. And underneath the HTML-code of the one that isn't uable.

Any ideas?