Hi,

I started to use iimage.el yesterday and like it.  However, it still
seems possible to *blindly* modify contents inside the display blocks
which is confusing.  Furthermore, if the regexp defining the block is 
destroyed that way, disabling iimage-mode does not remove the display 
block --- it will be stuck forever.

I therefore use a modification hook for removing the display block in
case the underlying text is modified.  Please find the patch attached, 
in case you like it.

Cheers,
Martin Pohlack