Lync Web App no sound and couldn't see shared desktop

Hi,
Today I tried to join a scheduled meeting which I've done may times before without any problem.
I was let into the meeting but had no sound and couldn't see the shared presentation. I could see other participants and see typed messages. There was a button in the middle of the screen 'Participate in the sharing session by clicking Rejoin'
Clicking the button did nothing.
The options button was telling me I had no Audio device. I did and it works correctly.
I'm using Win 7 and IE 11 but I also tried on Firefox and had the same issue.
I noted that despite using the Lync App many times, when I joined the meeting the App was either missing or wanted to update and I let this happen.
Any ideas what may be the issue here?

Hi There,
Thanks a lot for reporting this issue. And I am sorry that you are hitting this issue while attending Lync meetings. Following details will help us diagnose it further -
1) Do you have Lync 2010 or Lync 2013 client installed on the machine?
2) Do you get this issue again and again when you join the meeting or it was one-off?
3) When you killed "Lync Web App" from task manager, was audio flowing through even after that? Were you still attending the meeting from the browser?
4) How much time did you wait when UI was showing "Loading" until you killed the Lync Web App from task manager?
Thanks.
ManuMSFT
manums

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Lync Web App no sound and couldn't see shared desktop

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