@Michael_Condon Thanks for the response, I was finally able to get around to upgrading to the latest SDK and am still seeing the problem. Attendees of webinars are only able to see the “active speaker” window and not any of the other participants when using the custom UI feature of the windows SDK.
It looks like there has been a similar ongoing discussion in the Mac SDK forum as well and it seems like it is still a known bug there as well: Webinar host and panelists not visible to attendee when using CustomUI - #5 by jon.lieblich