[OSX] Embedding editor works only in debug?

Hi,

I'm working on a Mac port of wxMozilla and I've found that while editor 
embedding works fine on a debug build, release builds fail when I run the 
queryInterface call to get nsIEditingSession. As far as I can tell, all the 
necessary files are there in both debug and release builds (and I copied the 
same set of files for both builds). Does anyone have any tips on how to get 
this working in release build?

Thanks,

Kevin