IMP will logout when click to read mail.

[Jarungwit BOONPERM]

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Dear members,
    I used IMP-2.2.3, Horde-1.2.3 and Apache-1.3.14 on FreeBSD-4.1.1.
    I can used IMP before but now have problem.
    I install IMP on "/usr" partition. I check "/usr" partition
that full. Later I clear log file and "/usr" has free space. 
    But still problem.
    My problem that after I key login and password, I can swith to
Mailbox screen. But when I click to read mail, IMP will log out
and switch to first screen. (Welcome to IMP screen)
    I already attch file "php.ini.gz" and "error_log".
    Please let me know how to solve this problem ?
Please tell me more detail because my bad skill in PHP.
		thank you very much.
		    regards,
		   Jarungwit.

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