Updated 2017-10-19 – Additional information and a fix in the Adobe forum.
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Just a heads up that all versions of the vSphere Web Client 6.5 (and also at least vSphere Web Client Version 6.0.0 Build 361739) will crash with the below error if using Adobe Shockwave Flash version 27.0.0.170:
Shockwave Flash has crashed
To avoid the problem you should stick with an older version of Shockwave Flash or use the vSphere HTML5 client.
More information can be found here and from VMware this is a known bug and they have released KB 2151945 to inform about and address the problem.