eM6 does not save settings and does not work with yahoo

I am trying out eM6. I am prepared to pay for a pro license, but only if eM6 will work correctly.

I notice that many of your customers seem to have problems with Yahoo, which does not bode well.

So far, I am unable to get my frontier.com (running on yahoo servers) account to authenticate.
I can uncheck the calendar service and card/DAV service, but the setting re-appears upon closing and reopening the dialog.

I may be doing something wrong, but you don’t have phone support in the evaluation phase.

Please let me know either way (so I won’t waste any more time) if your program will work with Yahoo or if that’s a lost cause. 

Thank you in advance for your trouble,
Michael Mayer-Kielmann

Hello Barbara, are you having issues with your yahoo account setup? How did you setup your account in eM Client? Can you please make a screenshot of your account and services settings in Tools > Accounts > Your account, and submit the screenshots to us here on the forum?

What version of eM Client are you currently using on your computer? Can you please check the exact release number in Help > About?

I’m not getting any synchronisation issues with my yahoo account at the moment, but accounts hosted with yahoo have been generating a couple of issues in the past, however all were mostly server side issues.