can't go back, sometimes
Some of the time In Safari I cannot go back to the previous page either via the back button or gesture on my trackpad. I have only experienced this since i upgraded to Mt Lion a week ago. For example, I was on a website that had a link to a Vimeo video, went to it, then could not return to the previous site.
I have Safari 6.0.2. on an intel imac.
Any thoughts as to why this is???
iMac, Mac OS X (10.6.8)