Cant join polylines on same plane. No Gaps

[trimbla]

Ive got a serious stumper. I have a file from an engineer, Likely a Microstation conversion, that is giving me trouble. Im cleaning it up for an export to sketchup, and I cant get the polylines to join up and make closed objects. I have run an overkill command and a flatten command to make sure everything is as it appears. I can also draft new polylines from end segment to end segment with no luck. An intense close up zoom in doesnt reveal any gaps, and I have moved one endpoint and then moved it back on top of the other end via snaps with no luck. 

Im attaching the file so you can take a look, its driving me crazy.

[nestly2 · Accepted solution]

Polylines are UCS specific, and the polylines have a negative Z extrusion direction (LIST command) so they were either created in "Bottom" Orthographic view, or they were rotated/mirrored so they are effectively "upside-down"    Polylines that don't share a common extrusion direction can not be joined.  You can accomplish this by using UCS>Object, then re-creating the 2 unit long PLine, or draw a line (not Polyline) between the ends of the polylines and then FILLET them one-at-a-time with a zero radius fillet.

[trimbla]

Excellent! It was definitely quicker to just redraft this file as it was rather small, but I will be sure to pass the info along.

Files with elevations always seem to get crazy.