This is probably something obvious but I opened an old assembly today, created several months ago, and I cannot seem to toggle the sketches on.  Everywhere I go to turn them on the buttons are grey and faded.  In fact most of the buttons in view/hide are faded out.  Also, I don't know if there is any relation but the realview is also not available in this particular assembly.  I'm not having this problem in any of my other assemblies.

                                              ~Alex