Measurement tool shows dotted line or target point, but after clicking disappears.
Probably have Guides turned off.
Which version of SketchUp? SketchUp Free, which is web based, or SketchUp 2017 which is a desktop version. Please clarify your profile.
Just found this in spam. Yes, I have Sketchup2017. You were correct, the guides were turned off. I must have been moving too fast, or having a senior moment, and turned them off. I’m not very attentive or expert to all the settings, and didn’t realize one could even turn them off. I played around and finally found it.