If I tap (usually accidentally) instead of drag on a radius control point, the tube loses all radius values. You are left with a tube with one width. Don’t seem to be able to cancel or undo.
Problem doesn’t occur if I save the scene and re-open it… Only seems to happen on new scenes that have not been closed and re-opened(?)
It is fixed in Webdemo. Reported same issue yesterday, but there was an overall issue with primitives which fixes tube radius reset as well.