Reading mail from different locations

[Steinar Midtskogen]

I recently upgraded to Kubuntu 14.04 and Emacs 24.3.1, also forcing me to 
upgrade gnus (git clone as of a few days ago).  Gnus now behaves slightly 
different from what I'm used to.  I read my e-mail (imap server) from different 
locations: From home, from work (both gnus), from my phone and through 
Squirrelmail.  The trouble is that if I go through my mail, say from home, then 
read mail from work (or vice versa), gnus now fails to notice the tags that I 
set at the other location: Everything received since I last read at work is 
unread again.  This is pretty annoying.  Previously, the group list didn't 
update, but that was corrected when I entered the group which then always 
reflected the state on the server, not the state of the gnus when I previously 
used it at that location.

How can I fix this?