tonyk: This is not a problem with the previous version. The Wrapper supports mono. This is specific to this version of this plugin. Is this happening because of the multi channel routing in the plugin?
Most probably, yes. Seems like the wrapper does not fully conform to VST 2.4 specification which supports any channel configuration. Unfortunately, I'm unable to fix this problem from plug-in's side without breaking compatibility with other host applications that fully support VST 2.4 specification.