Trainz Attachment Point Issue

I’ve recently re-installed Trainz 2006 and upgraded to 3DC 7.1.2 after about a year away from both (due to computer issues). Prior to the break, I was using 3DC 6.5 with no problem.

Now, I’m noticing an issue when it comes to the attachment points after export into TRS. Everything works fine, but the small red triangles that represent the point are visible in-game. I don’t recall this happening before with older versions of 3DC. I can work around it by making the points invisible, but I never had to do this before. So, is this me messing something up, or is this a bug?

Any help would be appreciated,
Patrick