Recently I came across a strange issue. While trying to login to web client interface, suddenly started getting below error when clicked Login to web client and also in the vCloud Director interface. I tried several times, however it was the same error. Login page gets loaded however once clicked login, you get the Shockwave flash crash issue.
Fortunately when Searched, I came across announcement from adobe for Adobe flash player 27 Beta release. You can get this plugin at below link for download.
After updating plugin on my MAC system issue was fixed as in screenshot below.
Currently this flash player update is in beta so check your policies for production use. It is available for major platforms like windows, Linux and MAC.