for Join Polyline reads "Modify|JoinPolyline" in the Alias window. This command is not found in the "tconsole.txt" file, which leads me to believe this is a badly formatted Alias. Once I add my own Alias (i.e. "jp" and "joinpoly"), then "Modify|JoinPolyline" appears in the "tconsole" file. If they can fix the broken View aliases, this should be easy to fix.
The Join Polyline icon
is missing from the Classic UI. There is one for the 'Dark' UI.
TurboCAD LTE Pro (64-bit)