Did an extended data base rebuild. Back into surveyor. I can now lay more that 2 pieces of track without getting booted, but it will not lay at my selected gradient. So, by choosing Apply Gradient, I can then click on up to three pieces of track, one at a time, and get it to work that way. But no more than 3 at a time........clicking on the 4th one causes track to go WAY up in the sky: gradient over 20! Only way to do the Apply Gradient thing is to do 2 or 3, fill in the ground under the track, and then add 3 more sections, apply gradient, fill in the ground....etc. This sucks.