Media Upload Navigation (next link)

When using the Media Library selection in the “Add Media” popup (accessed when writing a post) the page number links and “next” link do not work. Ten images are shown with links to the next page to view the next set of ten images. When you click on #2 or Next> the screen reverts to the Choose File selection rather than page #2 of the media library.

In 2.5 this occurred on the Mac in Firefox and Safari. It worked correctly on the PC in Firefox and IE 6, 7.

In 2.5.1 this error occurs for both the Mac and PC in all browsers.

Has anyone else experienced this issue and resolved it?

Thanks in advance for any help!