Hi,
Yes, like the title says, I tried clearing my cache, including saved web data, in firefox, Chromium and Chrome and I still have black / blank screens for VM consoles, regardless of which ones they are.
I recently updated both the system and web client to 7388607 and 7119706 respectively.
The console had stopped working in Chrome at first, and then I tried Firefox and it worked the first time I had ever opened it in Firefox, which seemed to suggest that clearing the cache would have fixed it, but it did not.
I tried Chromium because I had never opened it in Chromium before, but it never worked at all.
Really not sure what's going on. Never had a problem like this before updating - have been using ESXi for about 3 years, since v5.0.
Any ideas?