Whenever you have an overconstrained sketch and add any sketch element, that does not add any constraints, the newly added sketch element does not appear.
If you add or change any constraint to the sketch (including autoconstraints on new sketch elements) the previously hidden element(s) are shown.
As for the crash, I haven't found out exactly under what circumstances it happens. Most often, it happens if you ctr+z shortly after the invisible sketch element is added. Sometimes, it happens even if the unconstrained sketch elements are unaffected by the ctrl+z.
How do I delete the config files? What files should I delete? I do have 0.16 installed as well, if that affects anything.chrisb wrote:I tested with exactly the same OSX FreeCAD-version. No problems here either.Kunda1 wrote:This may be MacOSX specific. Can any test on OSX?
My recommendation to the original poster sterna is to delete his config files, as 0.16 and 0.17 share the same config.