1. Here's why
This problem is caused by an error in the Dell Backup and Recovery software which is pre-installed on some Dell PCs.
The error affects Lumion and other applications that use the so-called Qt framework.
Dell has resolved this error in newer versions of the Dell Backup and Recovery software.
1.1: If you need to use the Dell Backup and Recovery software, you will have to install the latest version to make Lumion stop crashing.
1.2: If you do not need the Dell Backup and Recovery software, simply uninstall it to resolve the problem.