I followed the steps here: http://mrsztuczkens.me/jpibfi/#Troubleshooting and none of the suggested changes helped. The button is not showing up.
Here is our URL: http://www.knockknockstuff.com/blog/, and I enabled debug mode as instructed. We have version WordPress 3.2.1.
The ideas our developer had for why it might not be working are:
1) Maybe the Pin In plug-in we have from AddThis is conflicting with this additional plug-in for images only.
2) Maybe the fact that our images are wrapped with tags and link someplace.
Thanks in advance!