Shifting to the right

[tino.schlegel]

Nope. You have to give a link to your site to see whats actually wrong with it. But with the standard installation of v.1.3.8a there is no such problem for me. If there is a problem try to copy all installation files again and see if the problem is still there.

[Zinfandel]

Finally I found the problem.
It's the scroll bar!!!

The scroll bar shoves the whole page to the left and everything pops back to the right when it's not needed.

Can we shut the scroll bar off somehow so it doesn't behave this way ?

[tino.schlegel]

You can always show the vertical scroll bar so this does not happen. Not sure if its a good idea to always hide to scroll bar even when its needed.
To always show the scroll bar add

try:

html {overflow: scroll;}

or

html { margin-bottom: 1px; }

See http://snippets.dzone.com/posts/show/217

to your css file.