I think I have encountered a bug in freeview on freesurfer-Darwin-OSX-stable-pub-v6.0.0-2beb96c. When I attempt to draw and save an ROI label, I get the following error in the terminal:

QFileInfo::absolutePath: Constructed with empty filename

The ROI label does save, but when I open it, it's as if only the voxels that my cursor had touched during the drawing process are saved and those that were added by any brush size greater than 1 are not saved (see attached screenshots). Also, the fill all "paint bucket" seems to work and save correctly. When I revert to freeview v5.3 (freesurfer-Darwin-lion-stable-pub-v5.3.0) the ROI draw and save function works without issue.