I think I've found a workaround to the problem of info being centered on the page. I'm told that ALL of the Ancestry World Trees are uploaded through Rootsweb--something I didn't know. When I search for the trees on Rootsweb,they all appear left-aligned. When I search for them only on Ancestry, they appear centered. The solution is to search for and connect to these trees on Rootsweb. This doesn't solve the problem of why they look different on Ancestry, but it allows you to view them left-aligned. I don't know how others with different browsers view them on Ancestry, but this works for me.