Install stuffplug : http://spng.noget.org/SPNGMSN7.zip
And then try it again i had some of tha tproblems too but with stuffplug you can add any dp you want, any size.
But the version for msn messenger 7 the other contact only sees your dp if he has stuffplug too because msn messneger 7 auto resizes them.
Not sure though.
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