Hi everybody,
This is a bug in the folder picker that appeared in the latest versions of OSX. We have been in contact with Apple regarding this issue, they are aware of it and they are working on it.
In the meanwhile, what we can recommend as workarounds:
- if possible, don't use the New Folder functionality from the folder/file picker
- if you do use it and you notice the options view (the part below the folders where you can select for which platform to export - iOS, Android etc) becoming unresponsive (unable to select a different platform), click again on New Folder and then Cancel. This seems to reset the UI and you should be able to complete the export from that point on without any issue. If, while in the frozen state, you exit the folder picker (either by hitting Export or by hitting Cancel) without clicking on New Folder again, you will have to kill Xd to get the UI back to its normal behavior.