So now it's 4 hours later. I did some testing. Here's what I found. Most things, rolling stock or objects tab, show the circle for a split second and then the item renders without the circle. Some things, sometimes, take longer. If I clicked a different item while the circle was still showing, the circle stayed - forever, for all other items in that tab. I could switch to a different tab (eg object or rolling stock) there would be no circle. However, if I clicked on items and caught one while the circle was still showing from a previous item, the circle stayed - forever, for all other items in that tab.
Interesting, it would not be repeatable for any given item. It occurred with an A&SE SD 38. I exited Trainz. Went back in. Clicked the SD38 and the circle disappeared almost immediately. I clicked a few other items and it hung up on a 40ft boxcar.
What is repeatable, at least on my system, is, if the circle has not disappeared and I click another item - the circle stays until I exit the Route.
If any of you can duplicate these results, I'll submit a bug report.