[imp] Blank screen - Unable to reply messages stored in Chinese folder

[Fred Ho]

Hi,
   I am running Horde 3.0.9, IMP 4.0.4 on RHEL 4 with Courier
suite.
   We have occurrences from users that after they filed their
emails to the Chinese-named folder, they cannot reply/forward those
messages afterward. It worked okay in the INBOX folder though.

The php error logged the following:
[17- 1月-2006 17:13:02] PHP Fatal error:  Call to a member function 
on a non-object in /var/ww/html/horde/imp/lib/MIME/Contents.php on line 
532
[17- 1月-2006 17:13:37] PHP Fatal error:  Call to a member function 
on a non-object in /var/ww/html/horde/imp/lib/MIME/Contents.php on line 
339
[17- 1月-2006 17:14:42] PHP Fatal error:  Call to a member function 
on a non-object in /var/ww/html/horde/imp/lib/MIME/Contents.php on line 
532

line 532 is:
function findBody()
    {
        /* Look for potential body parts. */
        $part = $this->_message->getBasePart();

line 339 is:
function rebuildMessage()
    {
        $part = $this->_message->getBasePart();

Any ideas where to look for the cause of the problem? The system
used to work before when using an initial version of Horde 3 and IMP 4
(forgot their actual versions - quite earlier).

Regards,
Fred