I have a new odd observation, possibly related, possibly unrelated to this problem. When I use Project Profile To Element to project from LOW-R to P-DCH-R, the lines in the plan view showing the projection don't show up unless all of P-DCH-R is in the viewport. When I use the same tool to project from LOW-R to another plan element, it doesn't matter that I'm zoomed in to one area of the other element.
On the other hand, when I use the same tool to project from the construction limits line to P-DCH-R, the lines in the plan view showing the projection do show up. The lines showing the projection show up, but when I commit to the projection, the same thing happens as happens when I project LOW-R to P-DCH-R. Namely, that the projection runs only from about Sta. 5+00 to Sta. 15+00. (I realize that not all dynamic cross sections have all the same points and therefore the entire length may not have continuous linework. I did confirm that the projection of the construction stakes should have run up to the end of P-DCH-R.)
When I do see the lines showing the projection in the plan view, the entire north end of the alignment--the part where the loop is--is crazy.
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(Ignore the labels; they aren't relevant to this issue.)
Apparently the tool decides on a couple points that a bunch of the projection should converge on, and between these two points there are normal projections. (The point of convergence near the end of the alignment appears to be coincident with the end of the template drop.) Meanwhile, one of those key points and much of the normal projection is on an extension of P-DCH-R. Even so, the projection onto the profile runs only to Sta. 15+00, as mentioned above.
When I use Project Profile Range To Element from LOW-R to P-DCH-R, whether I lock to the beginning and end of the alignment, or I use a very small (non-looping) subset of the alignment, I get the same results as you can expect with the knowledge that nothing will show up after Sta. 15+00.
When I use the same tool from the construction limits to P-DCH-R and lock to beginning and end of the alignment, I get the usual projection up to Sta. 15+00, but also a flat horizontal line from Sta. 34+31 to the end, Sta. 48+30. (Sta. 34+31 seems to be the point on P-DCH-R's loop that could be considered to be diametrically opposite to Sta. 48+30.) When I use the same tool for the same elements but limit it to any segment to the north, unless that range spans both Sta. 34+31 and Sta. 48+30 nothing shows up. When that range does span both points, I get a flat horizontal line with just those 2 key points as VPIs.
With this new knowledge, I decided to look into projecting LOW-R again.
I projected LOW-R to P-DCH-R from Sta. 32+00 to Sta. 38+00: nothing. From Sta. 32+00 to Sta. 46+00: nothing. From Sta. 32+00 to Sta. 47+00: a decent-looking profile which runs from Sta. 34+08 to Sta. 46+31. From a look at the cross sections, this profile seems to match the model. (That was to confirm that it wasn't longitudinally translated.)
At this point, I have no idea what's going on or why.
I was hoping it wouldn't come to this, but I could do a secure upload of the file.
