Starting about two weeks ago, when I click on the Schedule icon it opens to a new screen that is not working. Per screenshot attached, it's missing most of the dialogue options. I fill out as able, hit “save” and a dial spins & spins and then I get the error message attached. I can't schedule a Zoom call.  Note that I've already tried removing and then reinstalling the Zoom app but problem remains. Zoom tech support has been non-responsive. Need Help. Thanks!

This is basic, I know, but I am unable to send my Zoom meeting to others' calendar, when I'm scheduling them.  I fixed it on one of my computers, but can't seem to find it on this computer.  I also can't find the steps to do so.  Can someone tell me how to set up my account so that the invite goes to clients' calendar?  I'd be so grateful!  Have a great day.

Hi, I'm an online teacher and I've noticed that when I'm using zoom annotation (which has never been a problem before) that sometimes even though the annotation is there for myself on screen, my students say that it has disappeared for them! The strangest part is that I played around to try and fix it and realised that the annotation randomly reappears for them when I open a new tab on my browser window! 
I have the most recent updated version of zoom.
 
Any ideas or thoughts that could help me fix this problem as it's very annoying and I never know it happens until my students tell me that it has happened (inconsistently). 

Many thanks for your help.