Pittsburger,
I have a similar problem with one of my Realtrax switches. In my case I have found that the issue was caused by one the leg of the spring slips over the round post and then it no longer has the same amount of pressure as before. See the green arrow on the picture which I modified from Pittsburghrailfan. This causes the rails to not fully close in one of the directions. This was only happening to one of the springs, and so the rails would not fully close in only one direction. The other direction seemed to work just fine (not that this made the switch usable).