I had an issue recently where one user was not able to share a poll, a whiteboard and a Powerpoint presentation.
The infrastructure was Skype for Business 2015 Server Standard with last CU (June 2016) and the clients were all having Skype for Business version 16.0.4432.1000.
But for only user this was not working and when he tried on another computer then it was working so it was due to his computer…
Indeed the KB3118288 was missing and as soon as we installed it, everything started to work on this computer.
Installing the KB does not change the client version and stay 16.0.4432.1000
Hop this will help some of you !