BuddyPress.org

http://goo.gl/zUiUO – this URL has been disabled.

There is no header image logo in bp-default theme. There is the site title link. Otherwise, what did you mean by “header logo”?

I see the site title and and the header search bar in page source code.

The problem was the absolute positioning of the site title and search bar in your stylesheet

replace:
`#header #search-bar {
left: 0;
position: absolute;
text-align: right;
top: 90px;
width: 100%;
}`

with
`#header #search-bar {
width: 100%;
}`

and work from there for the search

Then you have
`#header h1 {
position: absolute;
text-indent: -9999px;
top: 90px;
}`
and below that
`#header h1 {
bottom: 12px;
left: 15px;
position: absolute;
width: 44%;
}`

which you can remove and start from
`#header h1 {
width: 44%;
}`

then use Firefox with Firebug to test and copy styling if you wish.