Lync clients 2013 fails to show video, but 2010 works ok.

We'v migrated from 2010 to 2013 Lync server. But some Lync clients in remote places are still 2010.
And today I'v discovered that in a conference for 50+ participants but only one speaker (audio, video and presentation) for some reasons no one of 2013 client and WebApp could see a speaker video. I'v first restarted a client, then
a device, but no effect. After 30 minutes we have to start without a video, but some users with 2010 clients wrought that they have a video of the speaker.
I'v installed a Lync 2010 to my test PC, and on the same PC, with the same credentials 2010 client video is ok, and 2013 shows only a video placeholder.
I’v created a test conference, and the same situation repeats with only 4 clients.
Any suggestions ?

Hi,
From your description above, did you mean only 4 special Clients have this issue?
If yes, please try to check the OC firmware, delete Lync user profile and Lync information on Registry, then test he issue again. If the issue persists, please check if the Lync 2013 client update to the latest version.
Lync user profile: %UserProfile%\AppData\Local\Microsoft\Office\15.0\Lync
Lync user information on Registry: HKCU\Software\Microsoft\Office\15.0\Lync\[email protected]
Best Regards,
Eason Huang
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
Eason Huang
TechNet Community Support

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