@Anonymous hello, it could be your Revit program not installed properly or some files are corrupted. try to unistall and reinstall again and download from autodesk virtual agent. switch off all your anti virus and firewall before download. if you have macfee anti virus unistall first and reinstall again later after installation and see if helps, just a suggestion. thanks
Remember : without the difficult times in your LIFE, you wouldn't be who you are today. Be grateful for the good and the bad. ANGER doesn't solve anything. It builds nothing, but it can destroy everything...
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