For the past week or so, I have observed that when I try to take radial or diametric dimensions in FC18, the dimension lines appear in lala land.
While at this, a few words on taking radial and diametric dimensions: ALT-click on the arc/circle whose diameter or radius is dimensioned (the recommended way in the documentation for taking diametric or radial dimensions) has never worked for me on FC15, FC16, FC17, or FC18. To get a diametric or radial dimension, I have to first select the arc/circle, then activate the dimensioning tool (and after activating the dimensioning tool, press SHIFT to get the radius).
So, in FC18 (as in previous versions), I first select the curved edge and then activate the dimensioning tool to reproduce the above problem with diametric or radial dimension lines.
My FC18 as of now:
OS: Ubuntu 16.04.4 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.13559 (Git)
Build type: None
Branch: master
Hash: 68f25713d3802b2bafef13877417ba2a416bb929
Python version: 2.7.12
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: English/UnitedStates (en_US)