Ok. This began happening to me when I wanted to put money onto an website. I got an error anytime it popped up the payment thing that said "open window." I would then get a "sorry" error message telling me to wait. It's impossible to wait that much... it was also locking me out of putting money onto the site by every other browser & additionally other computers. Of course, I blame the website, it's the only explaination. Note: I cleared my cache and every single cookie, so it wasn't that. ADDITIONALLY: I am on a Mac running 10.8.2, but I don't know if that matters.
HOWEVER - I don't know if it will only work for me, or if it will help any of you, so I wanted to tell you what I did. I downloaded the Adobe Flash uninstaller from the internet, then I started the uninstaller, and once it was on the screen, I closed the browsers and uninstalled. I then opened the browser and downloaded the Adobe Flash installer. Again, I installed Adobe Flash (most recent version), and once again closed the browsers and allowed it to complete. I then opened my browser and went directly to the website and logged in. I went directly to the payment and this time, when the open window option for PayPal showed up, I clicked it to open. To my surprise, it allowed me to log-in and pay. I logged out of PayPal and closed the browser. When I opened the browser again, and tried the purchase to see what happens, the error is back! BTW, I tested it twice and both times it worked...
Hope it helps you all even though it's a ridiculous pain to do this EVERY time. Good Luck!
