Problems with 1.5.2 versus 1.5.1

I looked around for the answer to this but I've never seen anything that
matches this issue, so here goes.

I've been using Squirrelmail 1.5.1 for a while now, self-installed and all
(note that I don't have root on this system).  I created a parallel
installation of 1.5.2 (latest SVN) around the same time I installed that
(1-2 years ago now) and configured it similarly (most notably, I've enabled
filters on both).  When I first tried 1.5.2 I figured chalked this issue up
to it being inherently unstable or my php was old but now that I'm coming
back to it (with a newer PHP even) it's still not working any better and I'd
like to get to the bottom of why this is.

In 1.5.1 the filters work just fine and aren't causing any side-effects. 
All folders work as expected.

In 1.5.2, browsing my various mail folders (IMAP) works fine, but if I
enable filters a very weird thing happens: empty folders come up empty as
expected and the Inbox folder works as expected, but any other folder with
contents which is not Inbox ends up having a message list *exactly like
Inbox*, no matter what's really in it!  Selecting a message in those folders
produces an error (probably because they are actually Inbox messages in the
list and it's trying to map those message IDs into the sub-folder).  I'm not
sure what to make of this weirdness but again, it doesn't happen when I have
filters enabled (but from what I can tell filters should be pretty basic
stuff).

I'm using php 5.2.5.  The configtest results for 1.5.1 have no complaints
but 1.5.2 has one warning about magic_quotes_gpc being enabled (not sure I
can do anything about that but I suspect this has nothing to do with this
sort of issue).

IMAP info:
IMAP server ready (* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE
THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION
STARTTLS] Courier-IMAP ready. Copyright 1998-2005 Double Precision, Inc. See
COPYING for distribution information.)
    Capabilities: * CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE
THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION
STARTTLS

FYI, not sure if this is related or why it happens, but I see lots of PHP
warnings of the form, sometimes several per page, when debugging is set to
"SM_DEBUG_MODE_MODERATE | SM_DEBUG_MODE_ADVANCED":

Category:  	 PHP  [sometimes with ", Delayed" after it]
Message: 	A session had already been started - ignoring session_start()
FILE: 	/home/<my_login>/squirrelmail_1.5.2/functions/global.php
LINE: 	125

Thanks in advance for any advice or help! Given the unlikelihood that
filters have just been completely broken for 1-2 years I suspect there may
be a simple explanation for this.

    Marty

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