"ZSH" == Shenghuo ZHU writes:

 VVV> Thanks a lot, i'll try it. BTW, i just noticed that in 0.55
 VVV> there was a change in mm-view.el (mm-inline-text), which in
 VVV> effect changed with-temp-buffer to mm-with-unibyte-buffer (which
 VVV> is used in mm-get-part function). Maybe, changing
 VVV> mm-with-unibyte-buffer to with-temp-buffer in the definition of
 VVV> mm-get-part will fix this problem, too (which seems like a
 VVV> simpler fix)?

 ZSH> I did not find the change in ChangeLog. I did the last change in
 ZSH> 0.53.

there is the following hunk in the pgnus-0.54-0.55.diff: