I recently saw something about this a few weeks ago and didn’t think much of it, until today. Upon trying to log into my vSphere 6.x Web Client using CHROME. I was presented with a ‘Shockwave Flash has Crashed’ message. I thought to myself, well this is great timing. But I remembered seeing something about it. Took to Google and found a workaround from one of VMware’s KB articles.
Google Chrome was updated but Flash was not, therefore there were incompatibility issues between the two that affected VMware products.
Download the latest versions (188.8.131.52 or later) from https://get.adobe.com/flashplayer/
I didn’t take a screenshot of the error as I was in a hurry to get it fixed but below is similar to what you would experience.
Full KB Article: Shockwave Flash Crashes vSphere 6.x Web Client