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Is one of the lines something other than a plain polyline. I have sometimes frustrated myself trying to join two polylines only to find out one of them might be a polygon of some sort, like a rectangle 3" long and 0" wide. It looks like a polyline, properties says it is a polyline but it was drawn as a rectangle. I have not found a way to identify these little faux pas other than finally remembering that when I drew it, the command abruptly ended on the second point rather than offering to continue as it should have. I apparently had clicked the rectangle tool button instead of the polyline tool button. They are close together after all. Part of the program apparently remembers the object is a rectangle and refuses to join to it. Here's where somebody tells me to type the short cut because it is faster. That is fine if you don't have arthritis making your left hand only useful to lift a beer mug.