scrivener 3 won't open

Help! book deadline approaching and I could really do without this… I can get main interface to open but none of the actual projects. Any ideas? Haven’t updated anything on Mac so am baffled. (ETA: it keeps telling me it’s rebuilding search indexes…)

Point of clarification: does it just never get past rebuilding search indexes? Or what?

Is this happening with more than one project ( for example, does it happen with projects you haven’t just been working in)?