I changed squirrel to workaround this bug.
PHP 4.4.1
Broken PHP next() and prev() functions. Use PHP 4.4.0 or 4.4.x-dev snapshot. See [PHP bug report] and [patch]. Issue can be solved by enabling server side sorting in SquirrelMail (conf.pl -> 4. General Options -> 11. Allow server-side sorting) if your IMAP server supports it. Please note, that this is only quick workaround and unfixed PHP 4.4.1 setup is unreliable.
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Thanks, I'll keep it here for reference.
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Dupe. See 1420308.
Please note that patch does not fix hosed mbstring extension functions.