openxwpwidget plugin broken with 3.6.7

I was working on some client sites updating several plugins including the theme and noticed their OpenX ads no longer displayed. After a lot of sleuthing it seems the upgrade from 3.6.4 to .7 broke the plugin.

They have three sites with this theme. The two I upgraded to .7 no longer display the ads, although their test succeeds. The one site still at .4 works fine. I did the test to change the theme to the default theme and the ads appear fine.

You manually add the ads to whatever posts you want with this text:

{openx:XX}

XX is replaced with the zone id from the OpenX install.

If I can't get this to work with 3.6.7, is their a clean process to revert back to 3.6.4?

Thanks