Hi CarGa,
Someone else also reported this yesterday and these issues should now be fixed if you do svn update then rebuild with MonoDevelop.
For contributing, you can create svn patch files and email them to me (joe dot audette at gmail dot com), I will review and commit or else provide feedback. For big changes, probably best to discuss before doing the work. To contribute new features you can send a zip of files. Over time after I get to know you and if you contribute a lot we can consider svn commit access.
Thanks,
Joe