Hello, I've run into a bit of a problem.  I'm running TANE SP1 HF4, steam build 84473.  While working on my mountain route, I can't adjust any vertices above 3000 meters, either by applying a vertex height or using the height adjust tool.  As soon as I click on it, the vertex immediately drops to 3000 meters.  Anyone else have this issue, or am I missing something here?  Thanks for any help.