The weirdest thing happened. I'm using 2.6.2 and everything's fine, except when from my homepage I click on "next page" and get to page/2/ - my two right hand sidebars are placed at the bottom of the post as if part of my stylesheet is not being recognized. Stranger still when I click through to page/3/ it all goes back to normal. It only just started happening today.
It does this with every single theme that has a right hand sidebar so it seems to be something really broken in my wordpress install.
I've deactivated plugins. Just backing up now because I'm going to try and replace the wp-admin folder, see if that does anything. If not I'm going to have to try a reinstall.
Sigh... why do these things have to happen?
If anyone has seen this behavior before, please let me know.