I've built a few CMSMS sites without browser problems, and now I've got a doozy and I hope someone can help me a.s.a.p.
I had installed CMSMS 1.1.3.1 "Apia" - and for the template I'm using 'andreas01'
None of the versions of Internet Explorer are working, and I don't know where to start to fix this.
I went to Browsershots dot org and tested for 10 browsers - these are the results I have, showing I.E. behaving badly:

In the image above, the left and right browsers are correct - the 3 in the middle show menu, then further down the page - content - which is not correct.
Can anyone help me to understand what has to be done to get the site looking right in I.E?
I have used this same template for other sites with other versions of CMSMS without any problems.
Any help greatly appreciated!
Cheers
UPDATE : ISSUE resolved : html code had a problem.
Must remember to VALIDATE html in future

Thanks guys for your speedy help across the planet!