This drove me a bit crazy and wanted to provide the solution in case anyone else experiences the same thing – black boxes displaying behind flash elements in Safari, after installing Adobe Creative Suite 5.
Problem: After installing the CS5 Production Suite, I noticed that everywhere there was flash in Safari 5.0, some parts of it would have solid black displaying behind various elements.
Solution: After research and trial and error, determined that this wasn’t a Safari problem, but a bug in the version of Adobe’s Flash Player that installs from the CS5 Suite. The problem is solved easily by downloading the latest update that fixes this and other bugs with version 10.1. Here’s the link to the latest update download , simply install the update and the black displaying behind flash elements will be corrected.