I am running into when I hold a meeting I cant see attendees and they cant see me.

Hi, I am not sure if I selected a strange setting but when I am holding a meeting.  I cant see who is on the meeting and they cant see me its like I am waiting for them to join and they are there but I am not aware of it.  This is on desktop client.  Yesterday when this happened, I went in to the web portal and clicked on meeting and it worked.  Does any one know who to correct this so I can just hold meeting on my desktop client.  I know I probably set something that I shouldnt have so if anyone knows where I should go to correct this I would appreciate it so much.