When opening Firefox (3.6.16 or 4.0) and go to another link, firefox no longer remembers that initial (home) page.
3 computers (all Win 7, 64 bit): 1) upgraded to 4.0 from 3.6.16 and since reverted back to 3.6.16 2) upgraded to 3.6.16 from 3.6.15 3) completely new 4.0 installation. When browser is opened to home page and any link (or bookmark) is selected, the back arrow stays grayed out and the currently selected page becomes the "anchor" page that can be returned to. Same behavior on all three computers.
Checked this morning and all three computers' Firefox are working correctly now. No Windows patches have been applied and no Firefox updates are evident. The only software that could have updated and been causing the problem appears to be McAfee.