In the Modeler:
1. Create new ObjAttribute
2. Enter name, hit TAB
3. Type a custom java type, e.g. com.foo.X, hit TAB.
4. Java Type cell stays empty. The type is lost. (Same happens when typing one of standard type names, such as "int", but not selecting it from dropdown).
5. TAB out of "DbAttribute Path" cell doesn't save the value even if you select it with down keys from the dropdown. The only way to save it is to hit enter.