If you're having trouble seeing 3D views in Revit, you're not alone. This issue can be frustrating, but there are a few troubleshooting tips you can try to resolve the issue. First, check your graphics card and make sure it meets the minimum requirements for running Revit. If your graphics card is not up to par, you may need to upgrade to a more capable one. Next, make sure that you have the correct view settings enabled. Sometimes, 3D views can be hidden or turned off, so double-check your view settings to ensure that the 3D view is visible. Additionally, check for any overrides or filters that may be affecting the visibility of the 3D view. These settings can sometimes interfere with the display of 3D views, so make sure to review and reset any overrides or filters that may be causing the issue. If none of these troubleshooting tips resolve the issue, consider reaching out to Autodesk support for further assistance. They may be able to provide additional guidance and insights into the issue. By following these troubleshooting tips, you can hopefully resolve the issue and get back to working with 3D views in Revit without any further interruptions.