ZBrushCentral

trouble with snap

I am using zbrush 2018. I can use the transpose line but I can not get it to snap to points on my mesh. I am trying to use it for measuring. How do you get the transpose line to snap to points on the model?
I have looked everywhere and I can not find a tutorial on this.

Thanks in advance

Try changing the value in the Preferences>Transpose>Snap Max Distance slider.

I just tried that. It did not work. I can not seem to get the transpose line to snap to a line or a point. It will snap to 45 degree.

If anyone know how to make the transpose snap to points please help. Very stuck and very frustrated. Thnank you ahead of time

Please help. I am sorry if I sounded rude before. I am so frustrated. I have tried to set the snap max distance to 0, 80 and a few in between and nothing is working. I need very accurate measurements for printing and no matter what I do I cannot get the transpose line the snap to the second point. I have not changed any settings except the gradiant background. I have also not added any additional plugins other then what is provided. I have searched everywhere for an answer with no luck. I have seen videos where other people have no trouble with the snap. I could really use some help. Thank you.