I'm using the same version of Safari as you Liz and have no issues (not what you want to hear I know).
Do you know if you are using the Adobe PDF plugin viewer or the built-in one Safari has?
If you're not sure, go to these 2 folder locations:
/Users/YourUsername/Library/Internet Plug-Ins/
/Library/Internet Plug-Ins/
If there is an AdobePDFViewer.plugin present, drag it onto your Desktop to disable it. Restart Safari to pick up the change.