So my layouts validate nicely, look beautiful (at least to me!), work perfectly. Then I load them in IE 6 & 7, and everything falls to bits. IE8 is mostly ok.
I suspect that the responsive code is causing the biggest problems - tabs collapse into a single unstyled column and fluid-grid layouts appear as a single column (the TB site does the same, so it's not just me), so my first thing to try will be to disable that. I know this is par for the course with IE, but does anyone have any advice specific to getting reasonable-looking (I'm not looking for perfection!) output with TB in IE6 & 7?
