Suggestions and known issues -Use (hold) DKEY and CTRL+DKEY for freehand strokes -Before activating Bsurfaces V1.5 deactivate Bsurfaces GPL Edition V0.9 if it was active -Is a good idea to deactivate the option "Smooth Srokes" in Preferences ("Editing" tab). -When building surfaces with crossing strokes, if the operating system is Windows, making slower strokes ives better results. And since in Linux Blender handles better the tablet/mouse events, the strokes points are more dens in this operating system, which means better crsossing strokes detection at normal speed. -In case you use the "solo-mode" (NUMPAD /), don't use this tool whil in solo-mode, there can be a context error