Symptom: After users apply the Microsoft update KB3069392 or KB3124001, they can no longer share in WebEx meetings. When clicking the Share button, other participants only see a blank grey screen. This occurs for every meeting. Conditions: Clients with Microsoft update KB3069392 installed (or KB3124001 from January 2016 that supersedes KB3069392 : https://support.microsoft.com/en-us/kb/894199)