So, I did that (I’ve actually been using SegmentEditorExtraEffects already it’s pretty great; I didn’t know what mask volume did). Creating the masked volume worked fine. Then I went to the volume renderer; I selected the masked volume, and as soon as I clicked one of the volume renderer presets Slicer crashed. No messages or anything (not even the Windows crash dialog), it just closed; losing the work.
On restart I found that I could no longer import DICOM files (clicking the import button does nothing), could no longer see my DICOM database (empty), and I could no longer click the File, View, or Edit menus unless I clicked the Help menu first then moved the mouse to one of them.
I started ignoring modules and eventually found that the built-in DICOM module was the culprit. Ignoring it, and the menus work (although of course, I can’t load DICOM without it). Including it, and the problems happen.
So whatever happened when I picked a volume renderer preset broke the DICOM module permanently. It looks like I lost the DICOM database too.
I uninstalled and reinstalled Slicer and it’s still broken.
Not really sure what to do.