I had installed a plugin called TDO mini forms which has an option to use Ajax. I have one of the mini forms in a clone of your example widget. When I enabled the Ajax option the widgets in bp my home get frozen in place and the note pad no longer responds. I turned of Ajax and everything is good again. I had the same issue before but didn't know why. So it was a nice discovery.
I don't know that I need to enable Ajax, since I don't know what it is..
So no problem really, just thought you might like to know.
Keep up the great work!