On which platform? Is your OS fully patched and up-to-date?
Could you send us specific step-by-step instructions which are replicable?
Or, if this is specific to a particular file, please send in that file (post it here, or send it in to support@carbide3d.com) along with instructions for causing the problem and we’ll do our best to look into this.
The new v5:
now has OK, and Cancel buttons for editing toolpaths:
