I am having the same issue... I installed the OS 10.4.11 update, which includes Safari 3, and now Safari is behaving badly. I tried uninstalling (deleting) Safari and reinstalled the 10.4.11 update, but now I don't even see Safari in my app folder... but a program called "japanese.lproj" opened and acted just like Safari... for now I renamed it "Safari.app" and put it in my App folder. I'll reinstall Safari (if possible) from my Tiger Install disc, then try the upgrade again.
Here's problems I notice so far:
1) I type any URL into the address bar and hit "enter or return" but nothing happens. I have to refresh the page (curved arrow button or CMD+R on keyboard) to make the URL load. Stupid!
2) The "Google" Search are to the right of the URL address window doesn't work. I can type a search item in the google area and hit "enter" or even click the go button to the right, and still NOTHING happens. I have to manually type www.google.com into the address bar, refresh the page, get to Google homepage and do my searches from there.... what a pain!
Please help me resolve this. Thanks.