Wordpress 3.3.1 update broke the plugin

My client updated to 3.3.1 and the ChimpExpress plugin is no longer letting us get passed the second step when composing a new campaign. Is this a known bug and is there any fix available for it? I can provide more detail as needed about this issue. Thank you for your help!

I can confirm exactly what the OP says for WP 3.3.1.

For all who are having this issue, I have reverted the site back to Wordpress 3.2.1 and the plugin works again. That is a short term fix, though, and I would still like to know if this plugin will be updated in the future.

More detail on this:
I found this WP forums post about reverting wordpress to older versions:
wordpress.org/support/topic/31-looking-f...way-to-revert-to-305

Wordpress install/revert instructions are here:
codex.wordpress.org/Upgrading_WordPress_Extended

Older versions of Wordpress are here:
wordpress.org/download/release-archive/

Thanks for the post, but I don't think most of us can downgrade below 3.3 with medium-large sites

I'm having the same problem but on a new install of ChimpExpress and WordPress 3.3.1.
A fix for this would be greatly appreciated! Thanks!

Same here!