Hi, I have experienced this odd phenomenon several times lately. In a "Designer" puzzle, the design feature does not work the Add, or Delete features. They are not greyed out, they simply do not work. This is intermittent and not occurring in every designer puzzle.
What am I missing?
Cordially,
Merf.
Symmetry puzzles don't allow insertion and deletion of residues. Apparently there's some bug deep in the Rosetta code that has yet to be tracked down and which causes irreproducible crashes when adding/deleting residues: hence this feature was disabled for this type of puzzle. Personally I wish it wasn't disabled: this type of puzzle is already crash-prone and the pain of a few additional crashes would be less than that of rebuilding the puzzle to change the position of a single residue.