[Evolution] Colors Vanishing with IMAP

["Dominik Slusarczyk" <jabberduk gmail com>]

I use filters in Evolution to assign colors to messages in my IMAP
inbox.  I've discovered that when I connect to the IMAP account
with another client---in this case, Apple Mail, but I'd previously
observed this behavior with Horde's IMAP webmail client---Evolution
forgets about the colors.  "Important" flags remain, but colors
get reset entirely.  Does anyone understand why it happens? 
Is there a workaround that will let me make Evolution "remember" about
the color assignments between connections from another client?

Thank you in advance.

Dominik