Highlight doesn't work after a file has been inserted as MIME

Hi,

After inserting a file as MIME message (by C-c C-x TAB) and pressing
C-l, highlighting does not work anymore. Instead of using colorized
text, the draft is presented as black text only.

If I delete the [[..]] section and hit C-l again, everything works
fine.

Where and/or how can I fix this?

Emacs-22.1, Wanderlust CVS, SEMI-1.14.6, FLIM-1.14.8, APEL-10.7.

Regards,
Harald

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