The linetype does not show up, or only shows up on small sections of the. Using SPLINEDIT (How to convert splines to polylines in AutoCAD).
AutoCAD, all versions and M-Color, all versions
Summary
This article works as a checklist for solving why some objects in an AutoCAD drawing do not show in the M-Color MCL file when viewed in M-Color Preview.
More Information
Reasons in AutoCAD
Case 1: The object has been added to the AutoCAD drawing after the latest Preview and Plot command.
Solution: Do the Preview and Plot command to update the changes made in the drawing to the MCL file.
Case 2: The AutoCAD layer has the Do not plot property set on.
Solution: Turn the Do not plot property off and execute the Preview and Plot command.
Case 3: AutoCAD Architectural Desktop users may use various display configurations and they may show up differently in M-Color.
Solution: Try another display configuration in ADT.
Reasons in M-Color
Case 1: The M-Color Preview screen flashes and ends up solid white, solid black etc.
Solution: The M-Color paper frame is an ordinary AutoCAD polyline object and it is located on the layer 'M-Color' in AutoCAD. If this object is affected by some M-Color CFG layer which is on top of the the other CFG layers in M-Color CFG (Plot Appearance) then all you see is the M-Color paper frame filled with the fill style. You can add the layer 'M-Color' to the CFG and set that CFG layer off by clicking on the lamp icon in the Plot Appearance dialog. Note that in M-Color 9, the M-Color paper frame is no more added as a drawing object (polyline) to the MCL file as it used to be in the earlier versions.
Case 2: Some object does not show in M-Color Preview.
Solution: The CFG layer that the object is on may be off or the fill style and the outline style of the CFG layer are set to none.
References
M-Color Help: To investigate your CFG file use the Select CFG Layers command in the Plot Appearance dialog.
Yes, you are right. It is impossible to use Properties palette in such case (that was my fault)And it appears there is no simple way to flatten lines to UCS in AC for Mac. So my advice is to re-draw polyline above existing lines: just setup UCS you need, than start polyline at zero elevation and use object snap to endpoints of existing lines - polyline will be created flattened, because polyline is 2D flat object.Another way is to copy lines to new drawing after you setup UCS, than use Properties palette in this new drawing to change Z coordinates, than return back flattened lines to your first drawing using copy - paste procedure.Maxim.