"noVNC encountered an error" after updating

Jan 12, 2015
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Applied the recent round of patches last night and rebooted them. This morning when I try to get into a VM through the VNC console, I get "noVNC encountered and error" and the display never comes up. I'm using Firefox over an ssh tunnel to connect. Have tried CTRL+F5 as suggested to clear cache, but still nothing. Anything else to try?
 
do you have any browser extensions? if yes try to disable them and see if it works. alternatively you can open the js console and post all occurring errors here
 
Just an update. Working remotely again this morning with same problem (using Palemoon browser) Have ABPrime plugin installed. Disabled it, but after a restart it the problem was the same. Switched to Firefox and it's fine so definitely something with the browser/plugin.