3ds Max Modeling :: Close Open Spline

how I can easily find openings in a spline and/or overlapping vertices and edges that prevent the extrude modifier from working correctly?  I very frequently need to import .DWG's and .AI's and many times they have hundreds of vertices.  Even after I apply a normalize spline modifier to diminish the vertex count, it can be quite tedious to find breaks and overlaps.  I find fiddling with the weld verts also to be a pain (usually removes more vertices than I want).  I just want to graphically see it on the screen the problematic areas if possible.  Attached is a good example.  I can easily see on 2 of the splines the yellow vertex to signify start/finish but on the 3rd spline I don't see anything.  There are 2 vertices in the same spot and it looks like 1 white vertex.  I've never really used Xview but I'm probably not using it correctly.  When I use it I get a bunch of green vertices that aren't in any way overlapping.