I recently purchased your electronic simulator program, Crumb, for my Mac running on the Mojave operating system. While I am able to build circuits and load the demos, I am experiencing issues with their functionality. The circuits do not work at all, and the demos also. I have followed the instructions provided but have been unable to resolve the problem on my own. I kindly request your assistance in resolving these issues. I would appreciate any guidance or support you can provide to ensure that the circuits and demos function correctly on my system. Thank you for your attention to this matter. I look forward to your prompt response and a resolution to the problem.