This happened in the Diamond Titan gate, depth 21 Concrete Jungle: Blight Boulevard 1. I'm still there at the end gate as I report this.

I don't know, but when I started the level, the beginning stairs had 4 weird red boxes attached to them. I've done this level many times before and I've never noticed them before. Two of the boxes had white corners, the other had green (similar colour to everything else in the level). Here's some screens of those:

http://i932.photobucket.com/albums/ad167/dhking_photos/redbox1.png
http://i932.photobucket.com/albums/ad167/dhking_photos/redbox2.png

I continued on the level and when I got to the ending stairs, it had 14 of these strange boxes on them. Screencaps of these:

http://i932.photobucket.com/albums/ad167/dhking_photos/redbox3.png
http://i932.photobucket.com/albums/ad167/dhking_photos/redbox4.png

I don't know, I've really never noticed them before. Perhaps they are a new decoration Three Rings added in after today's update (this is my first time in this level since the last update)... But as ornate as they look, they don't seem to belong there. So, I'm unsure if it's a glitch or what.