Before we dive into the guts of the issue, we're going to need you to do
a few things for us, things that sometimes fix issues for users before
more extensive troubleshooting is needed. Can you please follow Steps 1-3
of our Solving Technical Issues checklist (confirm you're using the latest non-test version of Firefox or Chrome, and try using Firefox instead of Chrome/Opera; turn off all extensions, addons, and anti-virus; and clear your cache) to see if
one of those components is causing the problem? We can only help if we
can recreate your issue, so it is important that you follow each step. If doing that fixes the issue, just let us know. Otherwise, move on to Step 4 , and we'll need all that information, especially the console log starting from when you're alone and capturing what happens when people join you, to further assist you.