Yes it appears to be broken (I don't use this feature).
Hopefully the next update can fix it for you. On my side I would like to be able to have a "export selected" option or even better a setting to not export brush groups that are hidden and the UV mapping improvements described on mapscape web page
Hopefully EVOLVED can find some time to improve the software, it has a great potential for us who are working on old school FPS for example.