After Windows 10 update of September, 2nd the WebEx stopped working – it is displaying following message: “Invalid input or system error. Please try again or contact your site administrator.”

 

Bad news:

WebEx ignores the problem as WebEx is not compatible with Windows 10 (in compatibility matrices and words of tech support).

 

Good news:

There are two workarounds!

1. Use IETab in Chrome. When you connect to the WebEx from inside IETab it will reinstall the plugin and then connect correctly!
2. Use WebEx productivity tools to start new meetings or connect to ones you were invited do. Unfortunately this won’t work for meetings to which the invitation was forwarded for you – you must be on original list.

 

I’ll stay with IETab.