I updated the GCPTA plugin to .6.2. If I have it activated with Genesis Simple Sidebars, all the sidebars on my site disappear. Both plugins work okay, so long as the other is not active. :/
Feel free to take a look at a page where I'm using GCPTA:
http://www.fortworthretail.org/local-business (I've currently got GCPTA enabled and GSS disabled).
Not related, but possibly interesting...The first widget area in the sidebar is Genesis Featured Posts. It's set to only show the latest 2 posts. It returns 2 posts as expected everywhere on the site except for the GCPTA page linked above, where it returns all posts.
If it's be helpful to swim around the admin area on the site, I'd be glad to send a login.
Thanks for your help.