The Desktop app for Mac is not allowing me to log in.

Every time I try to log in, RC Meetings reports I am not connected to the Internet, and I need to check my network connection. My Internet connection works just fine because I can connect to every other Internet service or website I use. I can even connect to the RingCentral Glip app. Because I can't log in, I am unable to connect to meetings and the floating window with Join Meeting / Start Meeting buttons won't load. FYI: I am running RC Meetings for Mac version 6.3.135305.1213, which is the most recent version as reported by the application itself.