I use mailplane at home and at work.  I have had problems on both
computers.  The problem has affected all the accounts I use.  I've been
using both a work/ google business account and a personal gmail account.  I
am repeated signed out of my various accounts. The error states:  "You have
been signed out of this account.  This may have happened automatically
because another user signed in from the same browser.  To continue using
this account, you will need to sign in again.  This is done to protect your
account and to ensure the privacy of your information."  I am not having
any problems accessing the account through a web browser or my phone.  I've
checked my recent sessions in gmail, and there are no suspicious ISP's,
just home, work and the iphone.  I've tried logging out all the current
active sessions and that didn't work.  I've also tried changing my
password.  Any suggestions?  There are times when everything works
perfectly and then I won't be able to access the accounts at all.  I've had
the problem since last Thursday first at work and then later on at home.

-Tara