After installing the OS X 10.6.8 update on my iMac (10,1), when PDF files are opened within Safari, a blue circle appears, then a black screen with the first page of the PDF file. It will not open further or download.
I also downloaded the update on our older iMac (7,1) and the same thing happened. After visiting the Apple Store today, it was suggested that we reinstall Safari, which we did on both computers. This did not change the situation.
We also have a third computer, a laptop that has not been updated to 10.6.8. This computer has no problem. Any ideas?