Possible bug with projector/s

I'm using Unity 5.3.1f1...

The goal is to use projectors to "project" lazer scorch marks (/bullet holes) onto "stuff" (one of the recommended applications for projectors in the docs [ http://docs.unity3d.com/Manual/class-Projector.html ])...

It sort of works, but I'm encountering some odd visual glitches (no glitches with the first few scorch marks, but things get weird after 30 or so)...

For reference, here's a shot with no projectors in the scene:

and the possible bug:

The purple on the ice and weird shading on the "cannon base" should not be there. Both artifacts move around when the main camera moves, but only a little; the purple stays on the ice, and the weird shading stays on the cannon base.

I have a pool of 100 projector objects. Besides positioning the objects (I think they are positioned correctly; they are positioned where I expect), my scripts aren't touching the projector components themselves.

Thoughts?

Update: 2 steps forward, 1 step back. I re-examined the blob shadow from the standard assets, and realized I had failed to properly set my scorch mark texture's format. Switching the format to "Automatic Truecolor" made the purple and weird shading go away.

Unfortunately, whenever a projector lands on a sharp edge between two objects (the bottom edge of a cube where it meets the floor for example), the projection is ridiculously stretched. I would have thought the projected texture could not stretch past the near and far clip planes of the projector; but they are. Besides stretching, the projectors are only visible from a very short distance. They're invisible just a few steps back.

Here are some links to more screenshots: https://drive.google.com/file/d/0BwNPOufI_syBZG9HUWY0OTJ4emc/view?usp=sharing https://drive.google.com/file/d/0BwNPOufI_syBTVE5cWZzcFNvUjA/view?usp=sharing https://drive.google.com/file/d/0BwNPOufI_syBUVF3Wk9xX0pyZEk/view?usp=sharing https://drive.google.com/file/d/0BwNPOufI_syBT2FsSlRYbUdOZWs/view?usp=sharing https://drive.google.com/file/d/0BwNPOufI_syBbWNoelR2ai1kbDQ/view?usp=sharing https://drive.google.com/file/d/0BwNPOufI_syBNmRzNmg0VXF2YTA/view?usp=sharing https://drive.google.com/file/d/0BwNPOufI_syBbjNQNEdwYTg4UlU/view?usp=sharing

UPDATE 2: Just noticed some more weirdness; when the projectors are on a moving object, the projections can end up all over the place.

https://drive.google.com/file/d/0BwNPOufI_syBM00zSkEwdGcyRVU/view?usp=sharing https://drive.google.com/file/d/0BwNPOufI_syBYllUdzhHellNak0/view?usp=sharing

In addition to undesired stretching/projecting, the projectors are only visible from a set (typically short) distance. I have tried playing with the projector settings, but nothing I tried had a noticeable or positive effect. The exact distance varies, but I have not determined based on what. Sometimes the projections are only visible with the character standing directly in front of them, and the camera zoomed in. Other times, they are at least faintly visible from a reasonable distance... weird.