Thanks for getting back, as above, the woo-commerce theme does the following to your theme
1. Header content font will not change from large to small even when page layout with small header has been selected and with the two sets of css changes you provided above.
2. Gallery layouts do not appear or function at all, other than being used as backgrounds only
3. Page content, marginised against the right hand border (can't be seen...as if hidden behind the right hand border
These were the main issues, we got around another few very minor ones, but a test in unplugging woo commerce immediately reversed the above three major issues. We unplugged, and re-installed twice, with exactly the same result each time, so hence why we have unplugged woo altogether. As we didn't get any answers to the above posts, we just assumed woo was the cause, and that a custom css fix for every issue is really a bit of overkill, and that maybe a better relationship between woo and your theme, could be looked at.
Not sure how many other in total have experienced this, but it appears through the threads a few times.
Do you have any other recommendations??
Cheers, thanks for your help