GMAIL OAuth authentication window would not open when adding new account. I had an existing firefox browser session running. eM client was just waiting forever for OAuth window that would not open. I had to close down the firefox browser, and then the eM client opened a new firefox session automatically and opened the OAuth window. This is a bug! the eM client should have opened a new window in the existing firefox session. It took me almost 30 minutes to figure out that I had to close my existing firefox browser. eM version 7.2.34062.0
Thanks!
Paul Rich