Safari links get lost when Safari quits
I'm using Safari 6.0.2 - sometimes when it quits (automatically) and I restart safari, the tabs remain (upon restarting the app), but the actual links are missing in the url field and the pages in the tabs do not refresh. When I go to the specific tab it still retains the text/header from the webpage visited, but no way to refresh the page. Sometimes all tabs get lost and it defaults to "top sites" tabs and then i've lost the collection of websites I had open in the browser.
Anyone experience this or know how to resolve this?
MacBook Pro, Mac OS X (10.7.4)