Have you asked in the specific program forums to see if people there have seen the problem and have a solution
This forum is actually about the Cloud, not about using individual programs
If you start at the Forums Index http://forums.adobe.com/index.jspa
You will be able to select a forum for the specific Adobe product(s) you use
Click the "down arrow" symbol on the right (where it says ALL FORUMS) to open the drop down list and scroll
I've found that the latest version of Flash Player has a problem with iMacs made from 2006-2007.
I re-installed earlier version. YouTube videos work again.
Fortunately, I don't work with Flash… Probably will be able to install future versions.