my menu and dock bar disappear when using safari

For some reason when I use safari both my menu and dock bar disappear!?! Is this a new update and if not (or if so) can I get them both back while browsing the web? Also both menu bars will reappear when I scroll over them and I am able to "turn off hiding" on the dock bar; however, the dock bar disappears again once I switch to another program (pages, etc.). Then I have to go back and turn off hiding again. I can't get the menu bar to stick around at all. Please help!