It sounds as if you're still using the older JFBCLIke module. This module has not been included with JFBConnect for a couple of years now. We still supported sites that were using it, but we had to make some changes that broke it in the latest release. Please replace the JFBCLike module with the SCSocialWidget configured as Facebook -> Like Button widget. Those should render the exact same thing as the old module. The SCSocialWidget has been the new module to configure all of the different social widgets from a similar interface.
-Melissa