TEdit causing Abstract Error on Rio

I have just upgraded to Rio 10.3.2 from 10.2.3. On opening my existing project into Rio, every form that contains a TEdit causes an Abstract Error when it is created. The problem only manifests itself when compiling to MacOS (just 32 bit currently). Even if I delete all other components and code from the form (so I can have a completely blank form), I still get the error. If I start a new project and place an TEdit on it, it seems to works fine. Has anyone experienced the same issue and does anyone have any suggestions as to what is causing this? Any help would be greatly appreciated.